Chemoselective mono halogenation of β-keto-sulfones using potassium halide and hydrogen peroxide; synthesis of halomethyl sulfones and dihalomethyl sulfones
摘要:
The synthesis of alpha-halo beta-keto-sulfones using potassium halide and hydrogen peroxide as a chemoselective mono halogenation reagent and the synthesis of alpha, alpha-symmetrical and asymmetrical dihalo beta-keto-sulfones and alpha-halo, alpha-alkyl and beta-keto-sulfones is described. Base induced cleavage of alpha-halo beta-keto-sulfones, alpha,alpha-dihalo beta-keto-sulfones, and alpha-halo, alpha-alkyl beta-keto-sulfones afforded the corresponding halomethyl sulfones, dihalomethyl sulfones and haloalkyl sulfones. (c) 2006 Elsevier Ltd. All rights reserved.
的反应p -toluenesulfonylmethyl胩(TOSMIC)用α-溴代化合物有效地导致α-磺化酮,酯和酰胺的报道,其中TOSMIC作为磺酰化剂的显式的新角色被揭露首次。通过对照实验和DFT计算进行的机理研究表明,该反应是由Cu(OTf)2催化的TosMIC水合引发的,形成了甲酰胺中间体,该中间体在Cs 2 CO 3添加剂的介导下易于进行C-S键裂解。
the optimized reaction conditions. Mechanistic studies indicated that this transformation involved copper‐catalyzedNObond cleavage, activation of a vinyl sp2 CHbond, and CS bond formation. The oxime acetates act as both a substrate and an oxidant, thus the reaction needs no additional oxidants or additives.
Heterogeneous copper‐catalyzed oxidative coupling of oxime acetates with sodium sulfinates: An efficient and practical synthesis of β‐keto sulfones
作者:Jianhui Xia、Xue Huang、Shengyong You、Mingzhong Cai
DOI:10.1002/aoc.5001
日期:2019.8
An efficient and practical route to β‐keto sulfones has been developed through heterogeneous oxidativecoupling of oxime acetates with sodiumsulfinates by using an MCM‐41‐supported Schiff base‐pyridine bidentate copper (II) complex [MCM‐41‐Sb,Py‐Cu (OAc)2] as the catalyst and oxime acetates as an internal oxidant, followed by hydrolysis. The reaction generates a variety of β‐keto sulfones in good
Tetrabutylammonium iodide-catalyzed oxidative coupling of enamides with sulfonylhydrazides: synthesis of β-keto-sulfones
作者:Yucai Tang、Ye Zhang、Kaifeng Wang、Xiaoqing Li、Xiangsheng Xu、Xiaohua Du
DOI:10.1039/c5ob00742a
日期:——
A facile syntheticroutetowards pharmaceutically interesting β-keto-sulfone derivatives by tetrabutylammonium iodide (TBAI)/tert-butyl hydroperoxide (TBHP) mediated oxidative coupling of readily prepared enamides with economical sulfonylhydrazides is described. The corresponding β-keto-sulfone compounds were obtained in moderate to good yields. The present method is metal-free and base-free and shows
Aerobic Oxidation in Nanomicelles of Aryl Alkynes, in Water at Room Temperature
作者:Sachin Handa、James C. Fennewald、Bruce H. Lipshutz
DOI:10.1002/anie.201310634
日期:2014.3.24
On the basis of the far higher solubility of oxygen gas inside the hydrocarbon core of nanomicelles, metal and peroxide free aerobic oxidation of aryl alkynes to β‐ketosulfones has been achieved in water at roomtemperature. Many examples are offered that illustrate broad functional group tolerance. The overall process is environmentally friendly, documented by the associated low E Factors.
基于纳米胶束碳氢化合物核内氧气的更高溶解度,在室温下在水中实现了芳基炔烃至 β-酮砜的无金属和过氧化物有氧氧化。提供了许多示例来说明广泛的官能团耐受性。整个过程是环保的,由相关的低 E 因子记录。