2,2-dimethyl-5,5-diphenyl-5
H-2λ
5-[1,2]azaphosphole-3,4-dicarboxylic acid dimethyl ester 、
1,1,1-三氟丙酮 以
氯仿 为溶剂,
以46%的产率得到5,5,7-Trimethyl-2,2-diphenyl-7-(trifluormethyl)-6-oxa-1-aza-5λ
5-phosphabicyclo<3.2.0>hept-3-en-3,4-dicarbonsaeure-dimethylester