title: Changing reaction pathways of the dimerization of 2-formylcinnamates by N-heterocyclic carbene/Lewis acid cooperative catalysis: an unusual cleavage of the carbon-carbon bond.
abstract: Catalyzed by a triazole carbene, the dimerization of 2-formylcinnamates underwent benzoin condensation followed by intramolecular oxa-Michael addition to afford isochromeno[4,3-c]isochromene products. Under the catalysis of a combination of triazole carbene and Ti(OPr-i)4 catalysts, the dimerization reaction of 2-formylcinnamates proceeded through a completely different route to furnish the formation of isochromenone derivatives with the elimination of an acetate moiety.
authors.affiliation: College of Chemistry, Beijing Normal University , Beijing 100875, China.
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Dang
authors.forename: Zi-Tian
authors.initials: ZT
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Cheng