A Simple and Efficient Synthesis of Heterocycle-Fused 2<i>H</i>-Thiopyrans, Furo-, Benzofuro-, Thieno-, Benzothieno-, Pyrrolo- and Indolo-2<i>H</i>- thiopyrans, from Heteroaromatic Thioketones and α-Chloroacrylonitrile or α-Bromoacrylic Esters via a Hetero Diels-Alder Reaction-Dehydrohalogenation Process
An efficient and convenient procedure is described for the synthesis of heterocycle-fused 2H-thiopyrans having ortho-dimethylene structures via a hetero Diels-Alder reaction-dehydrohalogenation process starting from heteroaromatic thioketones and α-chloro-acrylonitrile or α-bromoacrylates.
OHMURA, HARUO;MOTOKI, SHINICHI, CHEM. LETT., 1984, N 11, 1973-1976
作者:OHMURA, HARUO、MOTOKI, SHINICHI
DOI:——
日期:——
THE REACTION OF 2<i>H</i>-THIIN DERIVATIVES WITH PERACID. RING CONTRACTION AND ALKOXYLATION REACTIONS
作者:Haruo Ohmura、Shinichi Motoki
DOI:10.1246/cl.1984.1973
日期:1984.11.5
The cycloaddition reaction of aromatic thioketones (aryl naphthyl thioketones and 2-benzofuryl phenyl thioketone) with 2-chloroacrylonitrile followed by elimination of hydrogen chloride gave some 2H-thiin derivatives. The products reacted with MCPBA and an alcohol to afford ring-contracted product and alkoxylated derivatives.
Cycloaddition Reactions of Heteroaromatic Thioketones with Maleic Anhydride, Norbornene, Acrylonitrile, Styrene, and 2-Chloroacrylonitrile
作者:Haruo Ohmura、Shinichi Motoki
DOI:10.1246/bcsj.57.1131
日期:1984.4
Heteroaromatic thioketones react with maleic anhydride, norbornene, acrylonitrile, and styrene to form the Diels-Alder adducts, respectively. The thioketones also undergo cycloaddition with 2-chloroacrylonitrile followed by elimination of hydrogen chloride to give heteroaromatic analogues of o-quinodimethan derivatives. In these reactions, the thioketones act as a heterodiene on the dienophiles to