methiodide of gramine 、
2-(6-Benzyloxycarbonylamino-3-tert-butoxycarbonylamino-2-oxo-hexyl)-malonic acid dimethyl ester 在
sodium methylate 作用下,
以76%的产率得到Methyl 8-benzyloxycarbonylamino-5(S)-tert-butyloxycarbonylamino-2-(indole-3-yl)methyl-2-methoxycarbonyl-4-oxooctanoate