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.