Selective Base-Promoted Synthesis of Dihydroisobenzofurans by Domino Addition/Annulation Reactions of ortho-Alkynylbenzaldehydes
作者:Giorgio Abbiati、Monica Dell’Acqua、Diego Facoetti、Elisabetta Rossi
DOI:10.1055/s-0029-1218766
日期:2010.7
nucleophilic addition/annulation reaction of ortho-alkynylbenzaldehydes in the presence of methanol. The reactions of aryl-, trimethylsilyl- and diethoxymethyl-substituted alkynylbenzaldehydes occurred with complete regioselectivity in good to excellent yields under microwave irradiation. The reactions of alkyl-substituted alkynylbenzaldehydes took place with good yields and high regioselectivity only when
二氢异苯并呋喃核的合成是通过在甲醇存在下,由邻炔基苯甲醛进行碱促进的串联亲核加成/环化反应实现的。在微波辐射下,芳基,三甲基甲硅烷基和二乙氧基甲基取代的炔基苯甲醛的反应具有完全的区域选择性,产率高至优异。仅当在室温下且在催化量的金(III)盐存在下进行时,烷基取代的炔基苯甲醛的反应才以高收率和高区域选择性进行。讨论了可能的反应机理。暂时合理地说明了炔基末端的取代基对环化模式的影响。 炔烃-杂环-多米诺反应-微波促进的合成-金