(3R,4S,5R,6R)-3,4,5-Tris-benzyloxy-6-trimethylsilanyloxymethyl-piperidin-2-one   、                                                                                      (2R,3R,4S,5R)-3,4,5-Tris-benzyloxy-2-(4-methoxy-benzyloxymethyl)-6-trimethylsilanyloxy-piperidine-1-carboxylic acid tert-butyl ester                                                                                                                                                              在
                                                                                                                                                                                 
三氟甲磺酸三甲基硅酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以90%的产率得到(2R,3R,4S,5R,6R)-3,4,5-Tris-benzyloxy-2-(4-methoxy-benzyloxymethyl)-6-((2R,3R,4S,5R)-3,4,5-tris-benzyloxy-6-oxo-piperidin-2-ylmethoxy)-piperidine-1-carboxylic acid tert-butyl ester