Chan–Lam-Type S-Arylation of Thiols with Boronic Acids at Room Temperature
摘要:
In this work, an efficient CuSO4-catalyzed S-arylation of thiols with aryl and heteroaryl boronic acids at room temperature is established. This catalytic system can an tolerate a wide variety of thiols and arylboronic acids in the presence of only 5 mol % of CuSO4 as the catalyst and inexpensive 1,10-phen center dot H2O as the ligand. Moreover, this catalytic system used environment-friendly solvent (EtOH) and oxidant (oxygen).
The first general methodology for the directthiolation of electron‐rich heteroarenes was developed by employing Pd/Al2O3, a recoverable and commercially available heterogeneous catalyst, and CuCl2. This method represents an operationally simple approach for the synthesis of these valuable compounds. Preliminary mechanistic studies indicate a heterogeneous catalytic system, in which both metals play
通过使用Pd / Al 2 O 3(一种可回收和可商购的非均相催化剂)和CuCl 2开发了第一种富电子杂芳烃直接硫醇化的通用方法。该方法代表了用于合成这些有价值的化合物的操作简单的方法。初步的机理研究表明,多相催化体系中的两种金属在硫醇化产物的形成中起着互补的作用。
Direct halosulfenylation of benzo[<i>b</i>]furans: a metal-free synthesis of 3-halo-2-thiobenzo[<i>b</i>]furans
example of the direct halosulfenylation of benzo[b]furans with commercially available disulfides and N-halosuccinimides has been achieved, providing an efficient metal-free synthetic pathway to access diverse 3-halo-2-thiobenzo[b]furans in moderate to excellent yields. In particular, a halogen (e.g., bromo or iodo) substituent on the benzo[b]furan ring is amenable for further synthetic elaborations
苯并[ b ]呋喃与市售二硫化物和N-卤代琥珀酰亚胺直接卤代亚磺酰化的第一个例子已经实现,它提供了一种有效的无金属合成途径,以中等到中等的程度使用各种3-卤-2-硫代苯并[ b ]呋喃。优异的产量。特别地,苯并[ b ]呋喃环上的卤素(例如,溴或碘)取代基适于进一步合成合成,从而扩大了产物的多样性。
Synthesis of 2-selenyl(sulfenyl)benzofurans via Cu-catalyzed tandem reactions of 2-(gem-dibromovinyl)phenols with diorganyl diselenides(disulfides)
作者:Jie Liu、Wei Chen、Lei Wang
DOI:10.1039/c3ra23361h
日期:——
An efficient synthesis of 2-selenyl(sulfenyl)benzofurans has been accomplished through a copper(I)-catalyzed tandem reaction of 2-(gem-dibromovinyl)phenols with diorganyl diselenides and disulfides in the presence of CuI/Mg/t-BuOLi in DMSO. Using this protocol, a variety of 2-selenyl(sulfenyl)benzofuran derivatives were obtained in good yields.