Mannich reactions of π-excessive heterocycles using bis-(dialkylamino)methanes and alkoxydialkylaminomethanes activated with acetyl chloride or sulphur dioxide
作者:Stephen C Eyley、Harry Heaney、George Papageorgiou、Robert F Wilkins
DOI:10.1016/0040-4039(88)85070-6
日期:1988.1
Π-Excessive heterocycles react rapidly with bis(dialkylamino)methanes (aminals) and alkoxydialkylaminomethanes (aminol ethers) in acetonitrile to afford Mannich bases in good yields when activated by means of an acidic reagent such as acetylchloride or sulphur dioxide: the principal compound studied was -methylpyrrole.
The generation of iminium ions using chlorosilanes and their reactions with electron rich aromatic heterocycles
作者:Harry Heaney、George Papageorgiou、Robert F. Wilkins
DOI:10.1016/s0040-4020(96)01174-x
日期:1997.2
have been used to generate iminiumions from aminals and aminol ethers derived from secondary alkylamines, including glycine derivatives, in aprotic media which were shown to undergo reactions with electron rich aromatic heterocycles, including furan, to give mono-aminoalkylation products in good yields. Whereas chlorotrimethylsilane has been shown to generate iminiumions from aminol ethers, no evidence
Solution processible poly(1-alkyl-2,5-pyrrolenevinylenes): new low band gap conductive polymers
作者:In Tae Kim、Ronald L. Elsenbaumer
DOI:10.1039/a706800j
日期:——
Bis(phenylthiomethylene) derivatives of 1-alkylpyrroles afford conjugated polymers by base induced elimination of thiophenyl groups.
通过碱诱导消除噻吩基团,1-烷基吡咯的双(苯硫基亚甲基)衍生物可生成共轭聚合物。
The activation of aminals and aminol ethers by sulfur dioxide and their reactions with electron rich aromatic compounds
作者:Harry Heaney、George Papageorgiou、Robert F Wilkins
DOI:10.1016/s0040-4020(97)00848-x
日期:1997.9
Reactions of bis(dialkylamino)methanes and ethoxydialkylaminomethanes with nucleophilic aromatic heterocycles in the presence of sulfur dioxide result in the formation of the expected Mannich bases in good yields. Reactions of phenols are similarly activated by sulfur dioxide which lead to improved regioselectivity: in particular the reactions of 2,5-dimethylphenol result in the formation of 2-dialkylaminomethyl-3,6-dimethylphenol whereas reaction occurs at the 4-position using the classical procedures. (C) 1997 Elsevier Science Ltd.