Highly<i>Z</i>-Selective Synthesis of Disubstituted α,β-Unsaturated Cyanides and Amides Using 10-P-5 Wittig Type Reagents
作者:Satoshi Kojima、Kazuhiro Kawaguchi、Shiro Matsukawa、Keiichiro Uchida、Kin-ya Akiba
DOI:10.1246/cl.2002.170
日期:2002.2
bearing cyanomethyl, acetamide, and N,N-dimethylacetamide groups were examined for Wittig type reactions. All three reacted to give the corresponding olefins. The reaction of the cyanomethyl reagent with aldehydes gave α,β-unsaturated cyanides with high Z-selectivity in the case of aliphatic aldehydes (Z:E=94:6 to 99:1). On the other hand, the reactions of the two amide reagents with aldehydes yielded
检查带有氰甲基、乙酰胺和 N,N-二甲基乙酰胺基团的磷烷 (10-P-5) 的 Wittig 型反应。所有三个反应得到相应的烯烃。在脂肪醛的情况下,氰甲基试剂与醛反应得到具有高 Z-选择性的 α,β-不饱和氰化物(Z:E=94:6 至 99:1)。另一方面,两种酰胺试剂与醛的反应产生了 α,β-不饱和酰胺,对芳香族和脂肪族醛都具有高 Z 选择性(Z:E=99:1 至 >99:<1)。