4-(2-chloro-3-nitrophenyl)-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylic acid dimethyl ester 在
N-溴代丁二酰亚胺(NBS) 作用下,
以
氯仿 为溶剂,
反应 0.5h,
以55%的产率得到4-(2-Chloro-3-nitro-phenyl)-2-methyl-5-oxo-1,4,5,7-tetrahydro-furo[3,4-b]pyridine-3-carboxylic acid methyl ester