(R)-2-{(S)-[(R)-2,2-dimethyl-1,3-dioxolan-4-yl]-hydroxy-methyl}-6-ethoxy-3-oxo-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester 在
sodium tetrahydroborate 、 cerium(III) chloride 作用下,
以
甲醇 为溶剂,
反应 3.0h,
以47%的产率得到(1S,3S,4S,8R)-3-[(R)-2,2-dimethyl-1,3-dioxolan-4-yl]-6-ethoxy-8-hydroxy-2-oxa-5-aza-bicyclo[2.2.2]octane-5-carboxylic acid benzyl ester