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