4-chloro-2-oxo-1-phenyl-1,2-dihydro-quinoline-3-carboxylic acid ethyl ester 、
邻甲苯胺 在
resultant mixture 、 aqueous solution 、
potassium hydrogensulfate 、 silica gel 、
water ethanol 作用下,
以
氯仿 为溶剂,
反应 5.0h,
以whereby 0.844 g of ethyl 4-(2-methylphenylamino)-2-oxo-1-phenyl-1,2-dihydroquinoline-3-carboxylate (Compound No. 33) was obtained (yield: 69.5%)的产率得到ethyl 4-(2-methylphenylamino)-2-oxo-1-phenyl-1,2-dihydroquinoline-3-carboxylate