4-Methyl-3,8,9,9a-tetrahydro-5H-7-oxa-6-aza-benzocycloheptene-1,2,6-tricarboxylic acid 6-tert-butyl ester 1,2-dimethyl ester 在
2,3-二氯-5,6-二氰基-1,4-苯醌 作用下,
以
苯 为溶剂,
以83%的产率得到2-O-tert-butyl 6-O,7-O-dimethyl 9-methyl-4,5-dihydro-1H-3,2-benzoxazepine-2,6,7-tricarboxylate