Visible-light-initiated regioselective sulfonylation/cyclization of 1,6-enynes under photocatalyst- and additive-free conditions
作者:Xiao-Xiao Meng、Qing-Qing Kang、Jun-Yao Zhang、Qiang Li、Wen-Ting Wei、Wei-Min He
DOI:10.1039/c9gc03769a
日期:——
additive, an economical, eco-friendly and practical strategy has been developed for the visible-light-initiated regioselective sulfonylation/cyclization of 1,6-enynes in a biomass-derived green solvent 2-methylTHF from easily accessible sulfonylchlorides under open-air conditions at room temperature. Compared with conventional heating conditions, the use of a 3 W blue light-emitting diode (LED) or sunlight
A good regioselective, high atom-economical and transition-metal-free method for the synthesis of α-functionalized ether derivatives via the domino radical cyclization of 1,6-enynes is described. A series of α-functionalized ether derivatives could be easily obtained in good yields with wide functional group tolerance by using less toxic and inexpensive Cs2CO3 as the base. The control experiment results
描述了一种良好的区域选择性,高原子经济性和无过渡金属的方法,该方法可通过1,6-烯炔的多米诺基环化反应合成α-官能化的醚衍生物。通过使用毒性较小且廉价的Cs 2 CO 3作为碱,可以容易地以良好的收率获得一系列具有广泛官能团耐受性的α-官能化醚衍生物。对照实验结果表明,该反应涉及自由基过程。这一策略为一步形成双CC键提供了一种区域选择性的方法。