(2R,4R)-2-(tert-Butoxycarbonylamino-methyl)-3-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-thiazolidine-4-carboxylic acid methyl ester 在
lithium hydroxide 作用下,
以
1,4-二氧六环 、
水 为溶剂,
以77%的产率得到(2R,4R)-2-(tert-Butoxycarbonylamino-methyl)-3-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-thiazolidine-4-carboxylic acid