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5
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80051780686
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For recent reviews on organocatalysis, see
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10
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80051791458
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For recent reviews on asymmetric enantioselective aza-Michael reactions, see
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For recent reviews on asymmetric enantioselective aza-Michael reactions, see
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15
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30044450480
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80051784847
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3-CHCH-MgBr to aldehyde 5 and subsequent oxidation. However, following this sequence, conjugated ketone 8 was obtained in lower yield (when compared to the three step procedure showed in Scheme 3) and as a 2:1 mixture of cis and trans diastereoisomers.
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3-CHCH-MgBr to aldehyde 5 and subsequent oxidation. However, following this sequence, conjugated ketone 8 was obtained in lower yield (when compared to the three step procedure showed in Scheme 3) and as a 2:1 mixture of cis and trans diastereoisomers.
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30
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80051802688
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3, TBAF or t-BuOK, although with some erosion of the final yield.
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3, TBAF or t-BuOK, although with some erosion of the final yield.
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75749146979
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80051801875
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Ref. 12a,b.
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50
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55949132372
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M.A. Wijdeven, R. Wijtmans, R.J.F. van den Berg, W. Noorduim, H.E. Schoemaker, T. Sonke, F.L. van Delft, R.H. Blaauw, R.W. Fitch, T.F. Spande, J.W. Daly, and F.P.J.T. Rutjes Org. Lett. 10 2008 4001
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53
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80051789400
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The diastereoselectivity of the allylation reaction was determined by GC-MS. Compound 10 was previously described by using a different allylation methodology (see Ref. 13f) although with poor selectivity.
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The diastereoselectivity of the allylation reaction was determined by GC-MS. Compound 10 was previously described by using a different allylation methodology (see Ref. 13f) although with poor selectivity.
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54
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33746703748
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An analogous epimerization was previously observed
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An analogous epimerization was previously observed: A. Kanakubo, D. Gray, N. Innocent, S. Wonnacott, and T. Gallagher Bioorg. Med. Chem. Lett. 16 2006 4648
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55
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62649136562
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