Simple and practical routes to 4,5-benzocycloheptenone. Ring enlargement of 3,4-dihydro-2-ethoxynaphthalene and 2-alkoxynaphthalenes with dichlorocarbene.
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概要
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An addition of dichlorocarbene generated by a phase-transfer reaction, to 3,4-dihydro-2-ethoxynaphthalene gave 7,7-dichloro-6-ethoxy-2,3-benzobicyclo[4.1.0]hept-2-ene, from which 4,5-benzocycloheptenone was derived in preparative yield. 2-Methoxy- and 2-ethoxynaphthalene were converted into 2-chloro-4,5-benzotropone in 33 and 66% yield, respectively, by treatment with large excess of ethyl trichloroacetate arid sodium methoxide.
- 公益社団法人 日本化学会の論文
著者
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Uyehara Tadao
Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University
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Kitahara Yoshio
Department Of Chemistry Faculty Of Science Tohoku University
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Nanbu Hirofumi
Department of Chemistry, Faculty of Science, Tohoku University
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Ichida Akio
Department of Chemistry, Faculty of Science, Tohoku University
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Funamizu Makoto
Department of Chemistry, Faculty of Science, Tohoku University
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