氯甲酸甲酯 、
(+/-)-trans-3-(4-hydroxybenzamido)-4-({4-[2-hydroxy-6-(hydroxycarbonyl)benzoyl]-3,5-dihydroxybenzoyl}oxy)pyrrolidine 在
吡啶 作用下,
以9%的产率得到(3R,4R)-3-[4-(2-Carboxy-6-hydroxy-benzoyl)-3,5-dihydroxy-benzoyloxy]-4-(4-hydroxy-benzoylamino)-pyrrolidine-1-carboxylic acid methyl ester