A convenient large-scale chiral synthesis of protected 2-substituted 4-oxo-piperidine derivatives
作者:Jesper F Lau、Thomas Kruse Hansen、John Paul Kilburn、Karla Frydenvang、Daniel D Holsworth、Yu Ge、Roy T Uyeda、Luke M Judge、Henrik Sune Andersen
DOI:10.1016/s0040-4020(02)00682-8
日期:2002.9
A convenient large-scale chiral synthesis of protected 2-substituted-4-oxo-piperidine derivatives is described. Hetero Diels–Alder reaction between trifluoroacetic acid–boron trifluoride activated (1-phenyl-ethylimino)acetic acid ethyl ester and 2-trimethylsilyloxy-1,3-butadiene gave rise to a mixture of two diastereomers of 4-oxo-1-(1-phenyl-ethyl)-piperidine-2-carboxylicacid ethyl ester. Starting