-
6
-
-
0000507716
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1988)
J. Org. Chem.
, vol.53
, pp. 4148-4149
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-
Feringa, B.L.1
Pineschi, M.2
Arnold, L.K.3
Yokoyama, H.4
Hayasaka, T.5
Ebihara, K.6
-
7
-
-
0027980834
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1994)
Tetrahedron: Asymmetry
, vol.5
, pp. 1431-1432
-
-
Kumamoto, T.1
Aoki, S.2
Nakajima, M.3
Koga, K.4
-
8
-
-
0027993384
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1994)
Tetrahedron Lett.
, vol.35
, pp. 8233-8236
-
-
Yamaguchi, M.1
Shiraishi, T.2
Igarashi, Y.3
Hirama, M.4
-
9
-
-
0343967492
-
-
and references cited therein
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1996)
J. Org. Chem.
, vol.61
, pp. 3520-3530
-
-
Yamaguchi, M.1
Shiraishi, T.2
Hirama, M.3
-
10
-
-
0041350014
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1997)
Synlett
, pp. 119-120
-
-
Inagaki, K.1
Nozaki, K.2
Takaya, H.3
-
11
-
-
0030697086
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1997)
Tetrahedron Lett.
, vol.38
, pp. 7745-7748
-
-
Alexakis, A.1
Vastra, J.2
Manganey, P.3
-
12
-
-
0030821778
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1997)
Tetrahedron: Asymmetry
, vol.8
, pp. 3193-3196
-
-
Alexakis, A.1
Vastra, J.2
Burton, J.3
Manganey, P.4
-
13
-
-
0030680243
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1997)
Tetrahedron Lett.
, vol.38
, pp. 7259-7262
-
-
Bako, P.1
Kiss, T.2
Take, L.3
-
14
-
-
0032554061
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(1998)
J. Am. Chem. Soc.
, vol.120
, pp. 441-442
-
-
Arai, T.1
Sasai, H.2
Yamaguchi, K.3
Shibasaki, M.4
-
15
-
-
0037174368
-
-
For the enantioselective Michael additions by donor activation, see: (a) Feringa, B. L.; Pineschi, M.; Arnold, L. K.; Yokoyama, H.; Hayasaka, T.; Ebihara, K. J. Org. Chem. 1988, 53, 4148-4149; (b) Kumamoto, T.; Aoki, S.; Nakajima, M.; Koga, K. Tetrahedron: Asymmetry 1994, 5, 1431-1432; (c) Yamaguchi, M.; Shiraishi, T.; Igarashi, Y.; Hirama, M. Tetrahedron Lett. 1994, 35, 8233-8236; (d) Yamaguchi, M.; Shiraishi, T.; Hirama, M. J. Org. Chem. 1996, 61, 3520-3530 and references cited therein; (e) Inagaki, K.; Nozaki, K.; Takaya, H. Synlett 1997, 119-120; (f) Alexakis, A.; Vastra, J.; Manganey, P. Tetrahedron Lett. 1997, 38, 7745-7748; (g) Alexakis, A.; Vastra, J.; Burton, J.; Manganey, P. Tetrahedron: Asymmetry 1997, 8, 3193-3196; (h) Bako, P.; Kiss, T.; Take, L. Tetrahedron Lett. 1997, 38, 7259-7262; (i) Arai, T.; Sasai, H.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 1998, 120, 441-442; (j) Hamashima, Y.; Hotta, D.; Sodeoka, M. J. Am. Chem. Soc. 2002, 124, 11240-11241.
-
(2002)
J. Am. Chem. Soc.
, vol.124
, pp. 11240-11241
-
-
Hamashima, Y.1
Hotta, D.2
Sodeoka, M.3
-
16
-
-
0034817259
-
-
and references cited therein
-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
-
(1994)
Chem. Lett.
, pp. 97-100
-
-
Kobayashi, S.1
Suda, S.2
Yamada, M.3
Mukaiyama, T.4
-
17
-
-
0030566793
-
-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
-
(1996)
Tetrahedron Lett.
, vol.37
, pp. 8921-8924
-
-
Bernardi, A.1
Colombo, G.2
Scolastico, C.3
-
18
-
-
0030768261
-
-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
-
(1997)
Tetrahedron
, vol.53
, pp. 13009-13026
-
-
Bernardi, A.1
Karamfilova, K.2
Sanguinetti, S.3
Scolastico, C.4
-
19
-
-
0002691788
-
-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
-
(1997)
Synlett
, pp. 568-570
-
-
Kitajima, H.1
Katsuki, T.2
-
20
-
-
0033541094
-
-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
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(1999)
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, vol.121
, pp. 1994-1995
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Evans, D.A.1
Rovis, T.2
Kozlowski, M.C.3
Tedrow, J.S.4
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21
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0033598250
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-
For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
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(1999)
Org. Lett.
, vol.11
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Evans, D.A.1
Willis, M.C.2
Johnston, J.N.3
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22
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0034817259
-
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For enantioselective Michael additions of silyl enolates or ketene silyl acetals, see: (a) Kobayashi, S.; Suda, S.; Yamada, M.; Mukaiyama, T. Chem. Lett. 1994, 97-100 and references cited therein; (b) Bernardi, A.; Colombo, G.; Scolastico, C. Tetrahedron Lett. 1996, 37, 8921-8924; (c) Bernardi, A.; Karamfilova, K.; Sanguinetti, S.; Scolastico, C. Tetrahedron 1997, 53, 13009-13026; (d) Kitajima, H.; Katsuki, T. Synlett 1997, 568-570; (e) Evans, D. A.; Rovis, T.; Kozlowski, M. C.; Tedrow, J. S. J. Am. Chem. Soc. 1999, 121, 1994-1995; (f) Evans, D. A.; Willis, M. C.; Johnston, J. N. Org. Lett. 1999, 11, 865-868; (g) Evans, D. A.; Scheidt, K. A.; Johnston, J. N.; Willis, M. C. J. Am. Chem. Soc. 2001, 123, 4480-4491.
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J. Am. Chem. Soc.
, vol.123
, pp. 4480-4491
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Evans, D.A.1
Scheidt, K.A.2
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Xu, Y.2
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Nishiwaki, N.1
Knudsen K., R.2
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37
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0001696290
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Kanemasa, S.1
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Yamamoto, H.3
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Wada, E.5
Curran D., P.6
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38
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Kanemasa, S.1
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Sakaguchi, S.-I.3
Yamamoto, H.4
Tanaka, J.5
Wada, E.6
Curran D., P.7
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39
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85031229318
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2 did not show any catalytic activity either.
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2 did not show any catalytic activity either.
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40
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85031229026
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Bulky amines such as TMP should be less coordinating to the metallic center of R,R-DBFOX/Ph complexes so that deactivation of the Lewis acid catalyst is relatively avoided.
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Bulky amines such as TMP should be less coordinating to the metallic center of R,R-DBFOX/Ph complexes so that deactivation of the Lewis acid catalyst is relatively avoided.
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41
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85031234266
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8b
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8b.
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42
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85031211543
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When the catalytic amounts of amines were reduced, both catalytic activity and enantioselectivities were much decreased.
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When the catalytic amounts of amines were reduced, both catalytic activity and enantioselectivities were much decreased.
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43
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85031210789
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Sometimes, when reactions are performed under a lower temperature such as -40 to -78°C, unexpectedly low enantioselectivities result. The reason has remained unsolved.
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Sometimes, when reactions are performed under a lower temperature such as -40 to -78°C, unexpectedly low enantioselectivities result. The reason has remained unsolved.
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44
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85031232049
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unpublished results
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Such intramolecular protonation has been involved in an enantioselective sequence of Michael addition/cyclization reactions of cyclic 1,3-diketones producing enol lactones under the double catalytic activation conditions. See: Ito, K.; Kanemasa, S., unpublished results.
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Ito, K.1
Kanemasa, S.2
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