(R)-((1S,2R,3R,4S,5S,6S)-1-Azido-4-benzyloxy-4-benzyloxymethyl-2-dimethoxymethyl-3,5,6-tris-methoxymethoxy-cyclohexyl)-hydroxy-acetonitrile                                                                                                                                                              在
                                                                                                                                                                                 
4-甲基苯磺酸吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以89%的产率得到(1R,4R,5S,6S,7S,7aS)-7a-Azido-5-benzyloxy-5-benzyloxymethyl-3-methoxy-4,6,7-tris-methoxymethoxy-octahydro-isobenzofuran-1-carbonitrile