| abstract |
(57) [Summary] (Modified) [Purpose] No zirconium compound 2, 3, 4, A method for producing 4,5-pentasubstituted-2-cyclopentenones is found. [Structure] 2,3,4,4-tetrasubstituted-2-cyclopentenones are represented by the following formula, which is characterized in that they are reacted with aldehydes in the presence of a 4- to 6-membered cyclic secondary amine. A method for producing 2,3,4,4,5-pentasubstituted-2-cyclopentenones. [For example, 2- (4-pyridylthio) -4-trimethylsilyloxy-4- (4-phenoxybutyl) -5- (P-Dimethylaminobenzylidene) -2-cyclopentenone] |