摘要:
A new synthetic method of (2E,4E)-dienals by four-carbon homologation of aldehydes is described. gamma-trimethylsilyl crotonaldimine 2 , easily generated from N-ter-butyl-crotonaldimine 1, LDA and ClSiMe3, reacts with aldehydes in the presence of catalytic CsF in DMSO at rt --> 100-degrees-C to afford homologous aldehydes 3 in good yields and with excellent (E,E)-selectivities.