title: An unusual Me3SiI-promoted [4+2] annulation and reduction: an efficient approach to construct 4H-benzopyrans.
abstract: Me(3)SiI-promoted reaction of salicylic aldehydes with β-dicarbonyl compounds provided a facile way to construct 4H-benzopyrans in moderate to good yields. This tandem reaction proceeds with high efficiency through nucleophilic addition, silyl enol ether formation, substitution, reduction, and intramolecular nucleophilic cyclization.
authors.affiliation: Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 MeiLong Road, Shanghai 200237, PR China. feijunwang@ecust.edu.cn
authors.forename: Feijun
authors.initials: F
authors.lastname: Wang
authors.forename: Mingliang
authors.initials: M
authors.lastname: Qu
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Shi
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D001578:Benzopyrans / Q000737:chemistry*; D002384:Catalysis; D003500:Cyclization; D007659:Ketones / Q000737:chemistry; D010084:Oxidation-Reduction; D014297:Trimethylsilyl Compounds / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D001578:Benzopyrans; D007659:Ketones; D014297:Trimethylsilyl Compounds; C419804:trimethylsilyl iodide