Substituent-dependent reactivity in aldehyde transformations: 4-(phenylethynyl)benzaldehydes versus simple benzaldehydes
作者:Isamu Katsuyama、Pandurang V. Chouthaiwale、Hai-Lei Cui、Yuji Ito、Ayumi Sando、Hiroaki Tokiwa、Fujie Tanaka
DOI:10.1016/j.tet.2013.03.056
日期:2013.5
Effects of substituents on transformations of 4-(phenylethynyl)benzaldehydes and related benzaldehydes were analyzed in aldol and thiazolidine formation reactions. The aldol reaction of 4-cyanobenzaldehyde was 54-fold faster than that of 4-methoxybenzaldehyde. In contrast, the aldol reaction of 4-(4-cyanophenylethynyl)benzaldehyde was only 1.4-fold faster than that of 4-(4-methoxyphenylethynyl)benzaldehyde