(R)-3-<(S)-1-ethoxycarbonyl-5-(4-piperidyl)pentyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzothiazapine-5-acetic acid 、
(S)-3-<(R)-1-ethoxycarbonyl-5-(4-piperidyl)pentyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzothiazapine-5-acetic acid 以
乙醇 为溶剂,
以62%的产率得到(R)-3-<(S)-carboxy-5-(4-piperidyl)pentyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzothiazepine-5-acetic acid