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2
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0029854666
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4
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0032503570
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For references to other synthetic efforts, see ref 4
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Forsyth, C. J.; Ahmed, F.; Cink, R. D.; Lee, C. S. J. Am. Chem. Soc. 1998, 120, 5597. For references to other synthetic efforts, see ref 4.
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Forsyth, C.J.1
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0033598241
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8
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85034134840
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note
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7d
-
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-
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10
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0023639370
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(c) Boeckman, R. K., Jr.; Charette, A. B.; Asberom, T.; Johnston, B. H. J. Am. Chem. Soc. 1987, 109, 7553.
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Boeckman R.K., Jr.1
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11
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0642376850
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equation presented
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(d) Okazoe, T.; Takai, K.; Oshima, K.; Utimoto, K. J. Org. Chem. 1987, 52, 4410. equation presented
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Okazoe, T.1
Takai, K.2
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Utimoto, K.4
-
12
-
-
85034149699
-
-
note
-
That 12 is not the result of epimerization of the axial methyl group was demonstrated via exposure of 14 to the reaction conditions; no epimerization occurred.
-
-
-
-
13
-
-
0012016624
-
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Evans, D. A.; Bartroli, J.; Shih, T. L. J. Am. Chem. Soc. 1981, 103, 2127.
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Evans, D.A.1
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-
14
-
-
85034122337
-
-
note
-
13C NMR spectra, as well as appropriate ion identification by high-resolution mass spectrometry.
-
-
-
-
15
-
-
4243825385
-
-
(a) Harada, T.; Yoshida, T.; Kagamihara, Y.; Oku, A. J. Chem. Soc, Chem. Commun. 1993, 1367.
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Harada, T.1
Yoshida, T.2
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Oku, A.4
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16
-
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84987472577
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(b) Seebach, D.; Imwinkelried, R.; Stucky, G. Helv. Chim. Acta 1987, 70, 448.
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Seebach, D.1
Imwinkelried, R.2
Stucky, G.3
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17
-
-
85034134225
-
-
note
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2O). Large-scale reactions do not proceed until catalytic TfOH (2-4 mol %) is added. Yields and diastereoselectivity were similar with the added TfOH.
-
-
-
-
18
-
-
0029916774
-
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(a) Lange, T.; van Loon, J.-D.; Tykwinski, R. R.; Schreiber, M.; Diederich, F. Synthesis, 1996, 537.
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Lange, T.1
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Diederich, F.5
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19
-
-
0032171542
-
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(b) For an improved general route to α,β-acetylenic aldehydes, see: Journet, M.; Cai, D.; DiMichele, L. M.; Larsen, R. D. Tetrahedron Lett. 1998, 39, 6427.
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Journet, M.1
Cai, D.2
DiMichele, L.M.3
Larsen, R.D.4
-
20
-
-
85034120793
-
-
note
-
2O/THF) afforded (+)-18 in 97% yield.
-
-
-
-
21
-
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0031028389
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Horikawa, Y.; Watanabe, M.; Fujiwara, T.; Takeda, T. J. Am. Chem. Soc. 1997, 119, 1127.
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Horikawa, Y.1
Watanabe, M.2
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Takeda, T.4
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23
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0030932870
-
-
α-Amido sulfones in a similar reaction, see: Alonso, D. A.; Alonso, E.; Najera, C.; Ramon, D. J.; Yus, M. Tetrahedron Lett. 1997, 53, 4835.
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Alonso, D.A.1
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Najera, C.3
Ramon, D.J.4
Yus, M.5
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25
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0032491812
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Evans, D. A.; Trotter, B. W.; Coté, B.; Coleman, P. J. Angew. Chem., Int. Ed. Engl. 1997, 36, 24, 2741.
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Evans, D.A.1
Trotter, B.W.2
Coté, B.3
Coleman, P.J.4
-
27
-
-
85034150116
-
-
note
-
The stereochemistry of (+)-16 was secured by NOE experiments and coupling constant analysis.
-
-
-
-
28
-
-
0000693134
-
-
For an example of an acetylene stabilizing an oxocarbenium ion in an acetal opening, see: Denmark, S. E.; Almstead, N. G. J. Am. Chem. Soc. 1991, 113, 8089.
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Denmark, S.E.1
Almstead, N.G.2
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29
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0028825262
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For an example of silyl enol ether isomerization, see: Duffy, J. L.; Yoon, T. P.; Evans, D. A. Tetrahedron Lett. 1995, 36, 9245.
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Duffy, J.L.1
Yoon, T.P.2
Evans, D.A.3
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