Diversity oriented synthesis of fused-ring 1,3-oxazines from carbohydrates as biorenewable feedstocks
作者:Lal Dhar S. Yadav、Vishnu P. Srivastava、Vijai K. Rai、Rajesh Patel
DOI:10.1016/j.tet.2008.02.084
日期:2008.5
Microwave enhanced diversity oriented synthesis (MEDOS) of various N- and O-heterocyclic systems fused with 1,3-oxazine ring is reported. The synthesis represents a new montmorillonite K-10 clay-catalyzed green protocol, which utilizes d-glucose/d-xylose as biorenewable feedstocks. d-Glucose/d-xylose-derived 1,3-oxazin-2-ones(thiones) either directly undergo K-10 clay-catalyzed cyclization to yield pyrano-/furo-1