Stereochemical Studies. XXVI. Asymmetric Synthesis using Proline Derivatives of optically Active Various 4, 4-Disubstituted 2-Cyclohexenones with Enamine Alkylation
作者:GENJI OTANI、SHUNICHI YAMADA
DOI:10.1248/cpb.21.2125
日期:——
Enamines III, prepared from some disubstituted acetaldehydes I and L-proline pyrrolidide (II), were alkylated with methyl vinyl ketone to generally afford optically active 4, 4-disubstituted 2-cyclohexenones V. This asymmetric synthesis is found to be widely applicable, their absolute configurations could be deduced by a comparison of the two substituents.
由一些二取代乙醛 I 和 L-脯氨酸吡咯烷酮 (II) 制备的烯胺 III 经甲基乙烯酮烷基化后,一般可得到具有光学活性的 4,4-二取代 2-环己烯酮 V。