Self-catalytic Michael reaction of enolizable carbonyl compounds. A facile route to α-methylene-δ-valerolactones
作者:Henryk Krawczyk、Marcin Śliwiński
DOI:10.1016/j.tet.2003.09.039
日期:2003.11
2-phosphono-5-oxoalkanoates 3 were prepared by the Michael reaction of enolizable carbonyl compounds with the acrylate 1. The corresponding 2-phosphono-5-oxoalkanoic acids 4 were converted into α-phosphono-δ-valerolactones 6. The products were shown to be useful substrates for the synthesis of α-methylene-δ-valerolactones 7 by the Horner–Wadsworth–Emmons reaction.
各种二环己基-2-膦-5- oxoalkanoates 3是由可烯醇化羰基的化合物与丙烯酸酯的迈克尔加成反应来制备1。相应的2-膦酰基-5-氧代链烷酸4被转化为α-膦酰基-δ-戊内酯6。该产品被证明是通过Horner-Wadsworth-Emmons反应合成α-亚甲基-δ-戊内酯7的有用底物。