An efficient and green method for the synthesis of [1,3]oxazine derivatives catalyzed by thiamine hydrochloride (VB1) in water
作者:Valmik D. Dhakane、Somnath S. Gholap、Umesh P. Deshmukh、Hemant V. Chavan、Babasaheb P. Bandgar
DOI:10.1016/j.crci.2013.06.002
日期:2014.5
Résumé An efficient and convenient synthesis of 1,3-oxazine derivatives has been achieved by the one-pot, multicomponent condensation of α- or β-naphthol, an aniline and formaldehyde using thiamine hydrochloride (VB1) as a versatile biodegradable and reusable catalyst in water as a universal solvent.
An Efficient Synthesis of 3,4-Dihydro-3-substituted-2H-naphtho[2,1-e][1,3]oxazine Derivatives Catalyzed by Zirconyl(IV) Chloride and Evaluation of its Biological Activities
作者:Amol H. Kategaonkar、Swapnil S. Sonar、Rajkumar U. Pokalwar、Atul H. Kategaonkar、Bapurao B. Shingate、Murlidhar S. Shingare
DOI:10.5012/bkcs.2010.31.6.1657
日期:2010.6.20
†An efficient and novel one-pot synthesis of new 3,4-dihydro-3-substituted-2H-naphtho[2,1-e][1,3]oxazine derivatives from 1-naphthol, various anilines and formalin at room temperature grinding is presented. The six-membered N,O-heterocyclic skeleton was constructed via zirconyl(IV) chloride promoted Mannich type reaction. In vitro antimicrobial activities of synthesized compounds have been investigated
Oxazine derivatives can be prepared with yield upto 98% within a few minutes by an efficient and novel one pot microwave- assisted three- componentreaction from 1-naphthol, various anilines and formalin using montmorillonite as the catalyst. The procedure is very simple, efficient and environmentally friendly as it does not use any toxic auxiliary or solvent. The key advantages of this process are