Unexpected product from the Dakin-West reaction of N-acylprolines using trifluoroacetic anhydride: A novel access to 5-trifluoromethyloxazoles
作者:Masami Kawase、Hiroshi Miyamae、Mariko Narita、Teruo Kurihara
DOI:10.1016/0040-4039(93)89032-l
日期:1993.1
The base-catalyzed reaction of N-acylprolines with trifluoroacetic anhydride proceeds through mesoionic 1,3-oxazolium-5-olates followed by the pyrrolidine ring cleavage to afford the 5-trifluoromethyloxazoles in good yields.
N-酰基脯氨酸与三氟乙酸酐的碱催化反应通过介电的1,3-恶唑鎓-5-油酸酯进行,然后进行吡咯烷环裂解,以高收率得到5-三氟甲基恶唑。