Decarboxylative Benzylations of Alkynes and Ketones
摘要:
Benzyl esters of propiolic and beta-keto acids undergo catalytic decarboxylative coupling when treated with appropriate palladium catalysts. Such decarboxylative couplings allow the benzylation of alkynes without the use of strong bases and/or organometallics. This allows the synthesis of sensitive benzylic alkynes that are prone to undergo isomerizations under basic conditions. Additionally, decarboxylation facilitates the site-specific benzylation of diketones and ketoesters under mild, base-free conditions. Ultimately, the methodology described expands our ability to cross-couple medicinally relevant heterocycles.
A new practical method for the synthesis of acetylenes.
作者:Jean Boivin、Laurent Elkaim、Paul G. Ferro、Samir Z. Zard
DOI:10.1016/s0040-4039(00)92375-x
日期:1991.9
The reaction of isaxazol-5-ones derived from β-keto esters and hydroxylamine with sodium nitrite and ferrous sulphate in aqueous acetic acid affords the corresponding acetylenes in moderate to good yield.