Efficient Synthesis of a Trisubstituted 1,6-Naphthyridone from Acetonedicarboxylate and Regioselective Suzuki Arylation
作者:John Y. L. Chung、Chaoxian Cai、J. Christopher McWilliams、Robert A. Reamer、Peter G. Dormer、Raymond J. Cvetovich
DOI:10.1021/jo0514927
日期:2005.12.1
An efficient five-step synthesis of 1,6-naphthyridone 3b, a p38 mitogen-activated protein (MAP) kinase inhibitor intermediate, in 32% overall yield starting from acetonedicarboxylate (ADC) is described. The synthesis began with a selective monoamidation of ADC dimethyl ester enolate 9. A novel concomitant enamine formation and an imide cyclization afforded the nitrogen differentially protected enamide