Four-Component Synthesis of Functionalized 2,2′-Bipyridines Based on the Blaise Reaction
作者:Hans-Ulrich Reissig、Paul Hommes、Phillip Jungk
DOI:10.1055/s-0030-1260304
日期:2011.10
In situ C-acylation of the Blaise intermediate - as reported by Lee and coworkers - provides α-acyl-β-enamino esters that are versatile building blocks for the preparation of N-heterocycles. The corresponding N-acylated β-ketoenamides can be employed in the synthesis of 4-hydroxypyridine derivatives. N-Acylation of the α-acyl-β-enamino esters with 2-picolyl chloride furnished β-ketoenamides, and the