1,1-Dioxo-3,3-dibutyl-5-phenyl-7-methylthio-8-[N-(S)-(α-carboxybenzyl) carbamoylmethoxy]-2,3,4,5-tetrahydro-1,5-benzothiazepine 、
N,N-二异丙基乙胺 、
甘胺酸甲酯 在
O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 、
乙酸乙酯 为溶剂,
以79%的产率得到1,1-Dioxo-3,3-dibutyl-5-phenyl-7-methylthio-8-[N-{(S)-α-[N'-(methoxycarbonylmethyl)carbamoyl]benzyl}carbamoylmethoxy]-2,3,4,5-tetrahydro-1,5-benzothiazepine