3-oxocyclohex-1-enyl cinnamate 在
5a(S),10b(R)-5a,10b-dihydro-2-(pentafluorophenyl)-4H,6H-indeno[2,1-b][1,2,4]triazolo[4,3-d][1,4]oxazinium tetrafluoroborate 、
potassium tert-butylate 作用下,
以
甲苯 为溶剂,
反应 15.0h,
生成 (R)-4-phenyl-4,6,7,8-tetrahydro-3H-chromene-2,5-dione 、
(S)-4-phenyl-4,6,7,8-tetrahydro-3H-chromene-2,5-dione