3,5-Dibenzoyl-2,6-bis-(4-chloro-phenyl)-4-cyano-tetrahydro-pyran-4-carboxylic acid ethyl ester 在
tetraphosphorus decasulfide 作用下,
以
xylene 为溶剂,
以55%的产率得到3,5-Dibenzoyl-2,6-bis-(4-chloro-phenyl)-4-cyano-tetrahydro-thiopyran-4-carboxylic acid ethyl ester