K-10 Clay-Catalyzed Enol-Driven
Decarboxylative Ring-Transformation Approach to Dihydro-
and Tetrahydroquinolines from Carbohydrates
作者:Lal Yadav、Chhama Awasthi、Vijai Rai、Ankita Rai
DOI:10.1055/s-2008-1078277
日期:——
An original synthetic approach to 4-polyhydroxyalkylquinolines using unprotected d-glucose/d-xylose as biorenewable resources is reported. The synthetic protocol involves enol-driven Michael-type addition of cyclic ketones to aldose-derived 1,3-oxazin-2-ones followed by decarboxylative ring transformation to yield various novel 5,6-dihydro-/5,6,7,8-tetrahydro-4-polyhydroxyalkylquinolines and their 5-, 6-, or 8-one analogues. This is a one-pot montmorillonite K-10 clay-catalyzed process proceeding under solvent-free microwave irradiation conditions.
报告了一种使用未保护的d-葡萄糖/d-木糖作为生物可再生资源合成4-多羟烷基喹啉的原创合成方法。合成协议涉及环酮对醛糖衍生的1,3-氧杂嗪-2-酮进行烯醇驱动的迈克尔型加成,随后通过脱羧环转化生成各种新颖的5,6-二氢/5,6,7,8-四氢-4-多羟烷基喹啉及其5、6或8-酮类类似物。这是一个在无溶剂微波辐射条件下进行的单锅蒙脱石K-10粘土催化过程。