(R)-7-acetamido-2-(tert-butoxycarbonyl)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid   、                                                                                      
3-[1-(2S-amino-3-methylbutyl)-3R,4R-dimethyl-4-piperidinyl]phenol                                                                                                                                                              在
                                                                                                                                                                                 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以65%的产率得到tert-butyl (3R)-7-(acetylamino)-3-{[(1S)-1-{[(3R,4R)-4-(3-hydroxyphenyl)-3,4-dimethylpiperidin-1-yl]methyl}-2-methylpropyl]carbamoyl}-3,4-dihydroisoquinoline-2(1H)carboxylate