Synthesis of α-Amidoketones through the Cascade Reaction of Carboxylic Acids with Vinyl Azides under Catalyst-Free Conditions
作者:Cai Gao、Qianting Zhou、Li Yang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.0c01871
日期:2020.11.6
An efficient synthesis of α-amidoketone derivatives through the cascade reactions of carboxylicacids with vinyl azides is presented. Compared with literature protocols, notable features of this new method include catalyst-free conditions, broad substrate scope, good tolerance of a wide range of functional groups, and high efficiency. In addition, the synthetic potential of this method as a tool for
Ethylene ketals of the type (I) cyclise in presence of phosphorus pentoxide in pyridine to give the ketal (II) which on hydrolysis yields 1-phenyl-6:7-dimethoxy-4-oxo-3:4-dihydroisoquinoline (III). 1-(4-oxo-cyclohexyl)-6:7-dimethoxy-3:4-dihydroisoquinoline (VIII) and 2-oxo-3-methyl-9:10-dimethoxy-1:2:3:4:6:7-hexahydro-11bH-benzo[a]-quinolizine (XV) were also synthesised.