丙二酸单乙酯 、 2-{[(E)-(S)-2-tert-Butoxycarbonylamino-2-carbamoyl-ethylimino]-methyl}-6-chloro-5-methyl-pyrimidine-4-carboxylic acid ethyl ester 反应 24.0h,
以10%的产率得到ethyl 2-<1-<<(S)-2<(tert-butoxycarbonyl)amino>-2-(carbamoyl)ethyl>amino>-2-(ethoxycarbonyl)ethyl>-6-chloro-5-methylpyrimidine-4-carboxylate