7-benzyloxy-4-(N-benzyl-N-tert-butylaminoacetyl)-2-indolecarboxylic acid methoxymethyl ester 、
甲醇 、
四氢呋喃 以
溶剂黄146 为溶剂,
以thus obtaining 450 mg of 7-hydroxy-4-(1-hydroxy-2-tert-butylaminoethyl)indole-2-carboxylic acid methoxymethyl ester acetate, decomposition point 165°-170° C.的产率得到7-hydroxy-4-(1-hydroxy-2-tert-butylaminoethyl)indole-2-carboxylic acid methoxymethyl ester acetate