Intramolecular [2 + 2]photocycloadditions of 1-(.omega.-alkenyl)-2-pyridones possessing an ester group on the olefinic carbon chain
Intramolecular [2 + 2]photocycloadditions of 1-(.omega.-alkenyl)-2-pyridones possessing an ester group on the olefinic carbon chain
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烯属碳链上具有酯基的 1-(ω-烯基)-2-吡啶酮的分子内 [2 2]光环加成
DOI:
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发表时间:
1992
期刊:
影响因子:
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通讯作者:
Tetsuro Shimo
中科院分区:
文献类型:
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作者:
K. Somekawa;H. Okuhira;M. Sendayama;Takaaki Suishu;Tetsuro Shimo
Photochemical reactions of three kinds of 1-(ω-alkenyl)-2-pyridones 1-8 were investigated. Photosensitized cycloadditions of 1-(ω-alkenyl)-2-pyridones and 1,3-bis(ω-alkenyl)-2-pyridone 2-6 afforded intramolecular [2+2]cycloadducts across the 5,6-bonds of the 2-pyridones to give the tricyclic lactams 14-18: the additions were site-, regio-, and stereospecific. The yields of the adducts diminshed in proportion to increased side-chain length