Norbornadiene-Fused Heterocycles: Syntheses and Cycloaddition Reactions of 2-Aryl-4,7-dihydro-4,7-methano-2<i>H</i>-isoindoles and 4,7-Dihydro-4,7-methanoisobenzofuran
previous claim of the synthesis of methanoisoindole derivatives was incorrect. 4,7-Dihydro-4,7-methanoisobenzofuran was prepared by the reduction of the norbornadiene-monocarbaldehyde with sodium borohydride and subsequent treatment with Amberlyst-15. The p-tolylmethanoisoindole reacted with dimethylacetylenedicarboxylate to give a novel 1 : 3 adduct. On the other hand, in the reaction of the methanoisobenzofuran
Neighboring Group Participation by Heteroaromatic Rings: The Wagner–Meerwein Type Skeletal Rearrangement in the Electrophilic Addition Reactions of Norbornadiene-Fused Furans, Pyrroles, and Thiophenes
作者:Tomoshige Kobayashi、Takeo Tsuzuki、Mayu Saitoh
DOI:10.1246/bcsj.72.1597
日期:1999.7
The electrophilic addition reactions of norbornadiene-fused furans, pyrroles, and thiophenes with bromine, arenesulfenyl chlorides, or a triazoledione generally afforded skeletally rearranged adducts except for a dibenzoyl-substituted thiophene. The formations of the adducts are attributable to the neighboringgroupparticipation by five-membered heteroaromatic rings, accompanied by the formations