BEMP-Promoted C(4)-Alkylation of 4-Alkyloxazol-5(4H)-ones: A Rapid and Efficient Route to α,α-Dialkyl-α-amino Acids
作者:Byeong-Seon Jeong、Yeon-Ju Lee、Jeyoung Seo、Dong-Guk Kim、Hyeung-geun Park
DOI:10.1055/s-0032-1317801
日期:——
Rapid and efficient C(4)-alkylation of 4-alkyloxazol-5(4H)-ones has been achieved by the utilization of BEMP as base. 4,4-Dialkyloxazol-5(4H)-ones, which can easily be hydrolyzed into free alpha,alpha-dialkyl-alpha-amino acids, were obtained in high yields (up to 99%) within a few minutes (1-18 min). BEMP, a sterically hindered strong base with low nucleophilicity facilitated the desired reaction, while decreasing the rate of side reactions such as O-alkylation, C(2)-alkylation and the breakage of oxazolone.