5,5'-((4-chlorophenyl)methylene)bis(1,3-diethyl-2-thioxodihydropyrimidine-4,6(1H,5H)-dione) 在
urotropine-bromine complex 作用下,
以
水 为溶剂,
反应 4.0h,
以0.417 g的产率得到5-(4-chlorophenyl)-1,1',3,3'-tetraethyl-2,2'-dithioxo-1,5-dihydro-2H,2'H-spiro[furo[2,3-d]pyrimidine-6,5'-pyrimidine]-4,4',6'(1'H,3H,3'H)-trione