N-(1-cyclopenten-1-ylcarbonyl)piperazine 、
2-氯-4-氨基-6,7-二甲氧基喹唑啉 在
甲醇 作用下,
以affords analytically pure 4-amino-2-[4-(1-cyclopenten-1-ylcarbonyl)piperazinyl]-6,7-dimethoxyquinazoline, m.p. 256.5°-258.0° C. (corr.)的产率得到1-(4-amino-6,7-dimethoxy-quinazolin-2-yl)-4-cyclopent-1-enecarbonyl-piperazine