N-Methylimidazole-promoted efficient synthesis of 1,3-oxazine-4-thiones under solvent-free conditions
作者:Mohammad A. Khalilzadeh、Issa Yavari、Zinatossadat Hossaini、Hasan Sadeghifar
DOI:10.1007/s00706-008-0042-1
日期:2009.4
AbstractA novel method for oxazine ring formation is established using the reaction of ammonium thiocyanate and acid chlorides with napthols in the presence of N-methylimidazole to afford [1,3]oxazine-4-thione derivatives in excellent yields. Graphical abstract
environmentally friendly and economical methods for the synthesis of biologically active heterocycles using readily available reagents remains a significant challenge in organic synthesis. In this context, organocatalysis has emerged as a powerful methodology in organic synthesis for the preparation of both simple and complex bioactive heterocycles Organocatalysts offer improved stability, lack of sensitivity