3,4-dihydro-4-oxo-2-trichloromethyl-2H-benzo[e]-[1,3]-oxazine-6-carbonyl chloride 在
petroleum ether 、
正丁醇 作用下,
以
正丁醇 为溶剂,
反应 0.5h,
以to give butyl 3,4-dihydro-4-oxo-2-trichloromethyl-2H-benzo[e]-[1,3]-oxazine-6-carboxylate, m.p. 134°-136° C.的产率得到butyl 3,4-dihydro-4-oxo-2-trichloromethyl-2H-benzo[e]-[1,3]-oxazine-6-carboxylate