methyl 4-phenyl-D-phenylglycinate   、                                                                                      
2,5-{[(tert-butoxy)carbonyl]imino}-2,5-dideoxy-3,4-O-isopropylidene-L-ribose                                                                                                                                                              在
                                                                                                                                                                                 
三乙酰氧基硼氢化钠                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,2-二氯乙烷                                                                                  为溶剂,
                                                                                                                                                                                        以49%的产率得到tert-butyl(3aR,4R,6aS)-4-{{[(1R)-1-biphenyl-4-yl-2-methoxy-2-oxoethyl]amino}methyl}-2,2-dimethyltetrahydro-5H-[1,3]dioxolo[4,5-c]pyrrole-5-carboxylate