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6
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0028898215
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For selected examples, see a) Chakraborty, T.K.; Hussain, K.A.; Thippeswamy, D. Tetrahedron 1995, 51, 3873.
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Chakraborty, T.K.1
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0000047706
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b) Boyd, S.A.; Mantei, R.A.; Hsiao, C.; Baker, W.R. J. Org. Chem. 1991, 56, 438.
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Boyd, S.A.1
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8
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0023676335
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c) Bühlmayer, P.; Caselli, A.; Fuhrer, W.; Göschke, R.; Rasetti, V.; Rüeger, H.; Stanton, J.L.; Criscione, L.; Wood, J.M. J. Med. Chem. 1988, 31, 1839.
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Bühlmayer, P.1
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Rüeger, H.6
Stanton, J.L.7
Criscione, L.8
Wood, J.M.9
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0025952925
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For a review, see a) Huff, J. R. J. Med. Chem. 1991, 34, 2305.
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Huff, J.R.1
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0028957345
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For selected examples, see a) Peyrat, J.-F.; Chaboche, C.; Figadère, B.; Cavé, A. Tetrahedron Lett. 1995, 36, 2757.
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Peyrat, J.-F.1
Chaboche, C.2
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Cavé, A.4
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17
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0009529286
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b) Dorsey, B.D.; Levin, R.B.; McDaniel, S.L.; Vacca, J.P.; Guare, J.P.; Darke, P.L.; Zugay, J.A.; Emmi, E.A.; Schleif, W.A.; Quintero, J.C.; Lin, J.H.; Chen, I.-W.; Holloway, H.K.; Fitzgerald, P.M.D.; Axel, M.G.; Ostovic, D.; Anderson, P.S.; Huff, J.R. J. Med. Chem. 1994, 37, 3445.
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Dorsey, B.D.1
Levin, R.B.2
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Darke, P.L.6
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Emmi, E.A.8
Schleif, W.A.9
Quintero, J.C.10
Lin, J.H.11
Chen, I.-W.12
Holloway, H.K.13
Fitzgerald, P.M.D.14
Axel, M.G.15
Ostovic, D.16
Anderson, P.S.17
Huff, J.R.18
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20
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0001162663
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e) Chakravarty, P.K.; de Laszlo, S.E.; Sarnella, C.S.; Springer, J.P.; Schuda, P.F. Tetrahedron Lett. 1989,30, 415.
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Chakravarty, P.K.1
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Springer, J.P.4
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b) Beard, C.D.; Baum, K.; Grakausas, V. J. Org. Chem. 1973, 38, 3673.
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Beard, C.D.1
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26
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0000766635
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a) Evans, D.A.; Morrissey, M.M.; Dow, R.L. Tetrahedron Lett. 1985, 26, 6005.
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Evans, D.A.1
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Dow, R.L.3
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0141997938
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Hanessian, S; Pougny, J.-R; Bossenkool, I.K. Tetrahedron 1984, 40, 1289.
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Hanessian, S.1
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33845280221
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Tomioka, K.; Cho, Y.-S.; Sato, F.; Koga, K. J. Org. Chem. 1988, 53, 4094.
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32
-
-
84920296985
-
-
note
-
Studies to try and epimerize the C-2 centre in compound 5 using a variety of bases proved challenging. Only tert-butoxide/THF gave a reasonable ratio (2:5 = 1:1), while other bases including DBU, failed to generate any of the desired isomer. Formation of the lithium enolate (dianion) of 6 followed by protonation with a variety of compounds bearing acidic protons on either oxygen or carbon were unrewarding.
-
-
-
-
34
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0019473369
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b) Melillo, D.G.; Liu.T.; Ryan, K.; Stetzinger, M.; Shinkai, I. Tetrahedron Lett. 1981, 22, 913.
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Melillo, D.G.1
Ryan, K.2
Stetzinger, M.3
Shinkai, I.4
-
37
-
-
84920296984
-
-
note
-
Encouragingly, the amount of C-2 epimer 13 was found to increase when LiOH was employed as the hydroxide source, however, further epimerization experiments using LiOH proved capricious.
-
-
-
-
39
-
-
0000601855
-
-
and references therein
-
For the use of α-trimethlysilylketones and aldehydes as alkene precursors, see a) Hudrlik, P.F.; Kulkarni, A.K. J. Am. Chem. Soc. 1981, 103, 6251 and references therein,
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Hudrlik, P.F.1
Kulkarni, A.K.2
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44
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85021541090
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b) Ryu, I.; Murai, S.; Niwa, I.; Sonada, N. Synthesis 1977, 874.
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Synthesis
, pp. 874
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Ryu, I.1
Murai, S.2
Niwa, I.3
Sonada, N.4
-
45
-
-
85083263815
-
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For a review see, Ager, D.R. Synthesis 1984, 384.
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Synthesis
, pp. 384
-
-
Ager, D.R.1
-
47
-
-
84920296983
-
-
note
-
In order to obtain consistently high yields for the cross-aldol step with l -trimethylsilylpropan-2-one, it must be stored at 0 °C and re-distilled prior to use.
-
-
-
-
48
-
-
84920296982
-
-
The use of diethyl ether as the solvent resulted in a 3:1 α:β ratio
-
The use of diethyl ether as the solvent resulted in a 3:1 α:β ratio.
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