(2R,4R,5R)-5-[2-(5-Benzyloxy-2,4-dimethoxy-3-methyl-phenyl)-2-oxo-ethyl]-4-carbamoyl-pyrrolidine-1,2-dicarboxylic acid 1-ethyl ester 2-methyl ester 在
喹啉 、 camphor-10-sulfonic acid 作用下,
以
苯 为溶剂,
以79%的产率得到(2R,3aR,7aR)-6-(5-Benzyloxy-2,4-dimethoxy-3-methyl-phenyl)-4-oxo-2,3,3a,4,5,7a-hexahydro-pyrrolo[3,2-c]pyridine-1,2-dicarboxylic acid 1-ethyl ester 2-methyl ester