1'-benzyl-1-(2-fluoro-6-(trifluoromethyl)benzyl)-1H-spiro[furo[3,4-d]pyrimidine-5,4'-piperidine]-2,4(3H,7H)-dione 、
1'-benzyl-6,7-dihydrospiro[cyclopenta[d]pyrimidine-5.4'-piperidine]-2,4-(1H,3H)-dione 以to obtain the title compound as white solid (23 mg, yield: 48%)的产率得到1'-benzyl-1-(2-fluoro-6-(trifluoromethyl)benzyl)-6,7-dihydrospiro[cyclopenta[d]pyrimidine-5 ,4'-piperidine]-2,4( 1H,3H)-dione