(2S,4R)-2-(3,3-difluorocyclohexyl)-4-phenylpiperidine 、
(4R,4'S)-8-methoxy-1'-(tert-butoxycarbonyl)-2,3-dihydrospiro[chromene-4,3'-pyrrolidine]-4'-carboxylic acid 在
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以41%的产率得到[(4R,4'S)-8-methoxy-1'-(tert-butoxycarbonyl)-2,3-dihydrospiro[chromene-4,3'-pyrrolidin]-4'-yl] [(2S,4R)-2-(3,3-difluorocyclohexyl)-4-phenylpiperidin-1-yl]methanone