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。
Ytterbium Triflate Promoted One-Pot Three Component Synthesis of 3,4,5-Trisubstituted-3,6-dihydro-2H-1,3-oxazines
An efficient one-potsynthesis of 3,4,5-trisubstituted-3,6-dihydro-2H-1,3-oxazines from acetylene dicarboxylates, aromatic and aliphatic amines, and formaldehyde is described. The six member N,O-heterocyclic nucleus was constructed via Yb(OTf)3 promoted domino hydroamination/Prins reaction/cyclization/dehydration reactions.Graphical Abstract