(S)-3-[1-tert-Butyl-7-(4-carbamimidoyl-phenylethynyl)-2,5-dioxo-1,2,3,5-tetrahydro-benzo[e][1,4]diazepin-4-yl]-butyric acid ethyl ester 在
lithium hydroxide 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以57%的产率得到(S)-3-[1-tert-Butyl-7-(4-carbamimidoyl-phenylethynyl)-2,5-dioxo-1,2,3,5-tetrahydro-benzo[e][1,4]diazepin-4-yl]-butyric acid