l-Proline-catalyzed synthesis of highly functionalized multisubstituted 1,4-dihydropyridines
作者:Huanfeng Jiang、Ronghuan Mai、Hua Cao、Qiuhua Zhu、Xiaohang Liu
DOI:10.1039/b914659h
日期:——
Highlyfunctionalized multisubstituted 1,4-dihydropyridines 5 have been concisely synthesized in moderate to good yields viaL-proline-catalyzed one-pot multicomponentreactions (MCRs) of alkynoates or alkynones 1, amines 2, β-dicarbonyl compounds 3 and aldehydes 4 under mild conditions. The MCR process involves hydroamination/Knoevenagel condensation/Michael-type addition/intramolecular cyclization
Synthesis of substituted 1,3-oxazines using sulfamic acid as an efficient and eco-friendly catalyst
作者:M. Damodiran、Paramasivan T. Perumal
DOI:10.1002/jhet.489
日期:2010.11
Sulfamic acid catalyzed the synthesis of substituted 1,3‐oxazines by one‐pot three‐component reaction of aniline, alkynoates, and formaldehyde in excellent yields. The catalyst possesses distinct advantages shows ease of handling, good yields, cleaner reactions, nonhygroscopic, noncorrosive, and high activity. Sulfamic acid is a green alternative for metal‐containing acidic materials, which are toxic
An efficient and novelone-potsynthesis of 3,4,5-trisubstituted-3,6-dihydro-2H-1,3-oxazine from alkynoates, anilines, and formaldehyde is described. The six-membered N,O-heterocyclic skeleton was constructed via Brønsted acid-promoted domino hydroamination/Prins reaction/cyclization/dehydration reactions.
描述了一种高效,新颖的一锅合成法,从炔酸,苯胺和甲醛合成3,4,5-三取代-3,6-二氢-2 H -1,3-恶嗪。通过布朗斯台德酸促进的多米诺加氢胺化/ Prins反应/环化/脱水反应构建了六元的N,O杂环骨架。
Si-OSO3H catalyzed one-pot three-component synthesis of 1,3-oxazines
作者:S. Sudha、M. A. Pasha
DOI:10.1007/s13738-014-0423-9
日期:2014.12
A simple and an efficient method for the synthesis of six membered nitrogen containing heterocyclic compounds—1,3-oxazines from diethyl acetylene dicarboxylate, substituted anilines or amines and formaldehyde is reported. A versatile, economical and eco-friendly heterogeneous reagent silica sulfuric acid (Si-OSO3H) is used as a catalyst for this reaction.