Phosphoric acid di-tert-butyl ester 4-{(4R,5S,6S,7R)-4,7-dibenzyl-3-[4-(di-tert-butoxy-phosphoryloxymethyl)-benzyl]-5,6-dihydroxy-2-oxo-[1,3]diazepan-1-ylmethyl}-benzyl ester 在
Amberlyst 15 ion exchange resin 作用下,
以
甲醇 为溶剂,
反应 5.0h,
以98.2%的产率得到[4-[[(4R,5S,6S,7R)-4,7-dibenzyl-5,6-dihydroxy-2-oxo-3-[[4-(phosphonooxymethyl)phenyl]methyl]-1,3-diazepan-1-yl]methyl]phenyl]methyl dihydrogen phosphate