Carboxylative cyclization of substituted propenyl ketones using CO<sub>2</sub>: transition-metal-free synthesis of α-pyrones
作者:Wen-Zhen Zhang、Ming-Wang Yang、Xiao-Bing Lu
DOI:10.1039/c6gc01346e
日期:——
Carbon dioxide is a green carboxylative reagent with regard to its non-toxic and renewable property. Described herein is a carboxylative cyclization of substituted 1-propenyl ketones via [gamma]-carboxylation using CO2, which...
Diversity-oriented general protocol for the synthesis of privileged oxygen scaffolds: pyrones, coumarins, benzocoumarins and naphthocoumarins
作者:Atul Goel、Gaurav Taneja、Ashutosh Raghuvanshi、Ruchir Kant、Prakas R. Maulik
DOI:10.1039/c3ob40859k
日期:——
A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studies of