α-Vinylation of β-aminothiophene derivatives. Synthesis of 6-functionalized thieno[3,2-b]pyridines
作者:M'hamed Berkaoui、Francis Outurquin、Claude Paulmier
DOI:10.1016/s0040-4020(98)00565-1
日期:1998.7
acid-catalyzed reductive α-alkylation of β-aminothiophenes was applied to the N-(thien-3-yl)acetamide and alkyl N-(thien-3-yl)carbamates. Without reduction, β-amino α-vinylthiophenes were obtained when α-branched aldehydes were used. β-(3-Aminothien-2-yl)α,β-unsaturated ketones, esters and nitriles were also prepared from the corresponding α-functionalized acetals. These amines are intermediates in the formation
将β-氨基噻吩的酸催化的还原α-烷基化作用于N-(噻吩-3-基)乙酰胺和N-(噻吩-3-基)氨基甲酸酯烷基。当不还原时,当使用α-支化醛时,获得β-氨基α-乙烯基噻吩。还从相应的α-官能化缩醛制备了β-(3-氨基噻吩-2-基)α,β-不饱和酮,酯和腈。这些胺是形成在吡啶环的β位带有官能团的噻吩并[3,2-b]吡啶的中间体。