Synthesis of 2-amino-4H-1,3-oxazines and 2-amino-4H-1,3-thiazines through a Yb(OTf)3-assisted, acid-catalyzed one-pot cyclocondensation reaction
作者:Salil Putatunda、Arijit Chakraborty
DOI:10.1007/s10593-015-1770-x
日期:2015.8
An efficient synthesis of 2-amino-4,6-diaryl-4H-1,3-oxazine and 2-amino-4,6-diaryl-4H-1,3-thiazine derivatives has been demonstrated through a one-pot multicomponent cyclocondensation reaction. Ytterbium triflate and concentrated HCl has been utilized as the catalyst system for this reaction. The method produced good to excellent product yields and allowed a wide variation of the substituents in both
通过一锅法证明了2-氨基-4,6-二芳基-4 H -1,3-恶嗪和2-氨基-4,6-二芳基-4 H -1,3-噻嗪衍生物的有效合成多组分环缩合反应。三氟甲磺酸和浓盐酸已被用作该反应的催化剂体系。该方法产生了良好或优异的产物收率,并且允许两个芳基部分中的取代基变化很大。
A Novel Three-Component One-Pot Reaction Involving Alkynes, Urea or Thiourea, and Aldehydes
作者:Shenlin Huang、Yuanjiang Pan、Yulin Zhu、Anxin Wu
DOI:10.1021/ol051458e
日期:2005.8.1
A novelthree-component, one-pot condensation yielding 2-amino-4H-1,3-oxazines or 2-amino-4H-1,3-thiazines from alkynes, urea or thiourea, and aldehydes is described. [reaction: see text]
Organo-nanocatalysis: An emergent green methodology for construction of bioactive oxazines and thiazines under ultrasonic irradiation
作者:Mohd Danish Ansari、Hozeyfa Sagir、Vijay B. Yadav、Neetu Yadav、Ankit Verma、I.R. Siddiqui
DOI:10.1016/j.molstruc.2019.06.052
日期:2019.11
Abstract A synergistic catalysts system ZnO NPs and Malic acid was used for the highly efficient and eco-friendly synthesis of oxazines and thiazines derivatives. Aldehyde, urea and alkyne derivatives are used as reactants under ultrasonication, which not only allows clean and rapid alteration but also simplifies experimental setup. High yields, environmentally benigness, simple work-up and shorter