The synthesis of benzoxepine and benzo-2H-pyran derivatives by the implementation of an inxepensive and easy to handle molecular iodine-mediated intramolecular electrophilic cyclization strategy is described. Simple substitution at the terminus of the propargyl group alters the course of the iodocyclization.
A visible light mediated alkyl sulfonylative cascade using Hantzsch esters<i>via</i>SO<sub>2</sub>insertion
作者:Indranil Halder、Akshay M. Nair、Chandra M. R. Volla
DOI:10.1039/d3cc01088k
日期:——
We hereby report a visiblelightmediated alkyl sulfonylative cascade cyclization of alkynyl and dialkynyl cyclohexadienones via SO2 insertion. The protocol utilizes alkyl Hantzsch esters as the alkyl source and DABSO as the SO2 source with 4-CzIPN as the organophotocatalyst. A variety of dihydrochromenone derivatives were obtained in good yields under mild energy efficient conditions. Additionally
我们在此报告了通过SO 2插入的可见光介导的炔基和二炔基环己二烯酮的烷基磺酰化级联环化。该方案使用烷基 Hantzsch 酯作为烷基源,使用 DABSO 作为 SO 2源,使用 4-CzIPN 作为有机光催化剂。在温和的节能条件下,以良好的产率获得了多种二氢苯并二氢苯醌衍生物。此外,还进行了荧光猝灭和控制研究以探究其机制。