PPh<sub>3</sub>⋅HBr-DMSO Mediated Expedient Synthesis of γ-Substituted β,γ-Unsaturated α-Ketomethylthioesters and α-Bromo Enals: Application to the Synthesis of 2-Methylsulfanyl-3(<i>2 H</i>)-furanones
作者:Kanchan Mal、Abhinandan Sharma、Prakas R. Maulik、Indrajit Das
DOI:10.1002/chem.201303755
日期:2014.1.13
An efficient chemoselective general procedure for the synthesis of γ‐substituted β,γ‐unsaturated α‐ketomethylthioesters from α,β‐unsaturated ketones has been achieved through an unprecedented PPh3⋅HBr‐DMSO mediated oxidative bromination and Kornblum oxidation sequence. The newly developed reagent system serves admirably for the synthesis of α‐bromoenals from enals. Furthermore, AuCl3‐catalyzed efficient
对于γ-β取代的合成的高效化学选择性一般方法,从α,β不饱和酮γ不饱和α-ketomethylthioesters已经通过了前所未有的PPH实现3 ⋅HBr-DMSO介导的氧化溴化和kornblum氧化反应序列。新开发的试剂系统可用于从enals合成α-溴烯醛。此外,还描述了AuCl 3催化在极温和条件下从上述中间体有效地获得3(2H)-呋喃酮的方法。