title: A copper(II) perchlorate-promoted tandem reaction of internal alkynol and salicyl N-tosylhydrazone: direct access to isochromeno[3,4-b]chromene.
abstract: A copper(ii) perchlorate-promoted tandem reaction of internal alkynol and salicyl N-tosylhydrazone provides a novel, concise method for constructing isochromeno[3,4-b]chromene in 35-94% yields. The tandem reaction involves cycloisomerization, formal [4+2] cycloaddition and an elimination process.
authors.affiliation: Shanghai Key Laboratory of Functional Materials Chemistry, Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China. liupn@ecust.edu.cn.
authors.forename: Hai Xiao
authors.initials: HX
authors.lastname: Siyang
authors.forename: Xu Rui
authors.initials: XR
authors.lastname: Wu
authors.forename: Xiao Yue
authors.initials: XY
authors.lastname: Ji
authors.forename: Xin Yan
authors.initials: XY
authors.lastname: Wu
authors.forename: Pei Nian
authors.initials: PN
authors.lastname: Liu
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D001578:Benzopyrans / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D061565:Cycloaddition Reaction; D006835:Hydrazones / Q000737:chemistry*; D015394:Molecular Structure; D010472:Perchlorates / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000480:Alkynes; D001578:Benzopyrans; D006835:Hydrazones; D010472:Perchlorates; C062280:copper(II) perchlorate; D003300:Copper