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67650332341
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A ratio of 4:1 in favor of syn was obtained when R2 is a methyl and the allylation reaction done in refluxing hexanes see ref 8b, In the case of R2, H, the ratio obtained was 6:1. The secondary hydroxyl group had to be protected in this case in a borinate and a monodentate Lewis acid used to activate the ester, Cardinal-David B. Ph.D. Thesis, Université de Montréal, 2008
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2 = H, the ratio obtained was 6:1. The secondary hydroxyl group had to be protected in this case in a borinate and a monodentate Lewis acid used to activate the ester. (Cardinal-David B. Ph.D. Thesis, Université de Montréal, 2008).
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49
-
-
67650332340
-
-
The optimization of this reaction was initially performed in benzene to avoid benzylic bromination. However, few reactions done in toluene demonstrate that good yields and excellent diastereoselectivites can be obtained which represent a great alternative to benzene (entries 1, 4, 5, 7, and 8 in Table 1 and entry 2 in Table 2).
-
The optimization of this reaction was initially performed in benzene to avoid benzylic bromination. However, few reactions done in toluene demonstrate that good yields and excellent diastereoselectivites can be obtained which represent a great alternative to benzene (entries 1, 4, 5, 7, and 8 in Table 1 and entry 2 in Table 2).
-
-
-
-
50
-
-
67650289087
-
-
The cyclic intermediates are unstable on silica. The allylated or vinylated products were observed in these cases
-
The cyclic intermediates are unstable on silica. The allylated or vinylated products were observed in these cases.
-
-
-
-
51
-
-
67650329290
-
-
See the Supporting Information
-
See the Supporting Information.
-
-
-
-
52
-
-
67650292344
-
-
See the Supporting Information for more details on the proof of structure of intermediates 48, 50, and 52a,b
-
See the Supporting Information for more details on the proof of structure of intermediates 48, 50, and 52a,b.
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