A new protocol for the alkenylation of carbonyl compounds with phosphonates (Horner-Wadsworth-Emmons reaction) is described. Aldehydes react with phosphonates already at room temperature in the presence of triethylamine without further activation by Lewis-acids if high-pressure (8 kbar) is applied to the system. Based on this protocol a domino process was developed combining the HWE reaction with a Michael reaction, thus allowing the one-pot synthesis of β-amino esters, β-thio esters or β-thio nitriles.
本文介绍了羰基化合物与
膦酸盐发生烯化反应(Horner-Wadsworth-Emmons 反应)的新方案。如果在体系中施加高压(8 kbar),醛与
膦酸盐在室温下就能在
三乙胺存在下发生反应,而无需
路易斯酸进一步活化。在此基础上,我们开发了一种多米诺工艺,将 HWE 反应与迈克尔反应相结合,从而实现了 δ-
氨基酯、δ-
硫代酯或δ-
硫代腈纶的一次合成。