Acetic acid (2R,3R,6R)-2-acetoxymethyl-6-cyano-4-oxo-tetrahydro-pyran-3-yl ester 在
L-Selectride 作用下,
以
四氢呋喃 为溶剂,
生成 Acetic acid (2R,3S,4R,6R)-2-acetoxymethyl-6-cyano-4-hydroxy-tetrahydro-pyran-3-yl ester 、 Acetic acid (2R,3S,4S,6R)-2-acetoxymethyl-6-cyano-4-hydroxy-tetrahydro-pyran-3-yl ester