Acetic acid (1S,2R,4S,5R,6S,7R)-7-cyano-7-(dimethoxy-phosphoryl)-3-oxa-tricyclo[3.2.1.02,4]oct-6-yl ester                                                                                                                                                              在
                                                                                                                                                                                 sodium tetrahydroborate   、                                                                                                  
potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以75%的产率得到((1S,2S,3S,5S,6R)-6-Cyano-2-hydroxy-3-hydroxymethyl-bicyclo[3.1.0]hex-6-yl)-phosphonic acid dimethyl ester