Cycloaddition reactions of 1,3-diazabuta-1,3-dienes with alkynyl ketenes

TETRAHEDRON

卷:65

Article

Abbiati, Giorgio¹  Contini, Alessandro¹  Nava, Donatella¹  Rossi, Elisabetta¹ 

[1] Univ Milan, DISMAB Sez Chim Organ Alessandro Marchesini, I-20133 Milan, Italy

关键词: 1,3-Diazabuta-1,3-dienes;    Alkynyl ketenes;    [2+2] Cycloaddition;    [4+2] Cycloaddition;    Azetidin-2-ones;    Dihydropyrimidinones;   

DOI  :  10.1016/j.tet.2009.04.041

来源: Elsevier

【 摘 要 】

The cycloaddition reactions of 'all-carbon' 1,3-diazabuta-1,3-dienes with a few conjugated and un-conjugated alkynyl ketenes are described. The reactions provide some interesting azetidinones and dihydropyrimidinones bearing an alkynyl moiety. The regiochemistry of cycloadduct is related with the degree of conjugation of the alkynyl ketene. Moreover, two alternative approaches to 'all-carbon' 1,3-diazabuta-1,3-dienes are reported. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

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