2-[4-Chloro-8-(3,4,5-trimethoxy-benzyl)-7,8-dihydro-6H-pyrimido[5,4-b][1,4]oxazin-2-ylamino]-4-methyl-thiazole-5-carboxylic acid ethyl ester 、
哌嗪 以
正丁醇 为溶剂,
生成
4-Methyl-2-[4-piperazin-1-yl-8-(3,4,5-trimethoxy-benzyl)-7,8-dihydro-6H-pyrimido[5,4-b][1,4]oxazin-2-ylamino]-thiazole-5-carboxylic acid ethyl ester