tert-butyl 4-((3S)-3-azido-4-phenyl-2-(2-phenylacetoxy)butanamido)piperidine-1-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 polymer supported triphenylphosphine                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以96%的产率得到tert-butyl 4-[[(4S)-2,4-dibenzyl-4,5-dihydro-1,3-oxazole-5-carbonyl]amino]piperidine-1-carboxylate