(1S,6S)-5-(4-piperidyl)-2-oxa-5-azabicyclo[4.4.0]decan-4-one 、
4-((2,2-difluoroethoxy)methyl)cyclohexanone 在
crude product 、
乙腈 、
水 作用下,
以to give the Diastereomer 1 and Diastereomer 2 of the title compound的产率得到(4aS,8aS)-4-(1-(4-((2,2-difluoroethoxy)methyl)cyclohexyl)piperidin-4-yl)hexahydro-2H-benzo[b][1,4]oxazin-3(4H)-one