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for chiral enamine-based asymmetric α-alkylation of cyclohexanone, see
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53349122064
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for recent organocatalytic ́-alkylation using ́-bromocarbonyl compounds, see
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Molecular modeling calculations support this analysis: D. M. Hodgson, N. S. Kaka, K. N. Houk, J. M. Um, unpublished results.
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Molecular modeling calculations support this analysis: D. M. Hodgson, N. S. Kaka, K. N. Houk, J. M. Um, unpublished results.
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See the Supporting Information for details
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See the Supporting Information for details.
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20
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57549086630
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Enamine 5a could be prepared by aldehyde-amine condensation (benzene, Dean-Stark trap, 42 h), but in only 26%yield and as a 4:1 E:Z mixture.
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Enamine 5a could be prepared by aldehyde-amine condensation (benzene, Dean-Stark trap, 42 h), but in only 26%yield and as a 4:1 E:Z mixture.
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Attempted C-alkylation using MeI with the enamine derived from MacMillan's imidazolidinone (T. J. Peelen, Y. Chi, S. H. Gellman, J. Am. Chem. Soc. 2005, 127, 11598-11599) was not successful.
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Attempted C-alkylation using MeI with the enamine derived from MacMillan's imidazolidinone (T. J. Peelen, Y. Chi, S. H. Gellman, J. Am. Chem. Soc. 2005, 127, 11598-11599) was not successful.
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