Synthesis of 2-Acylbenzo[<i>b</i>]thiophenes via Cu-Catalyzed α-C–H Functionalization of 2-Halochalcones Using Xanthate
作者:Subramani Sangeetha、Govindasamy Sekar
DOI:10.1021/acs.orglett.7b00462
日期:2017.4.7
An efficient protocol is described for the synthesis of 2-acylbenzo[b]thiophenes from easily accessible 2-iodochalcones through α-C–H functionalization using Cu(OAc)2 catalyst and xanthate as sulfur source. Less reactive 2-bromochalcones also yielded the corresponding 2-acylbenzothiophenes in good yield. The reaction proceeds via in situ incorporation of sulfur followed by copper-catalyzed cyclization
描述了一种有效的规程,用于使用Cu(OAc)2催化剂和黄原酸酯作为硫源,通过α-C–H官能化,从易于获得的2-碘对二苯并呋喃中合成2-酰基苯并[ b ]噻吩。反应性较低的2-溴查耳酮也以良好的产率产生相应的2-酰基苯并噻吩。该反应通过硫的原位结合进行,然后进行铜催化的环化反应,生成没有外部酰基源的2-酰基苯并噻吩。合成的重要性通过1-(5-羟基苯并噻吩-2-基)乙酮的合成得到了展示,这是一种已知的mRNA前剪接调节剂。
Copper-catalyzed synthesis of 2-acylbenzo[<i>b</i>]thiophenes from 3-(2-iodophenyl)-1-arylpropan-1-ones and potassium sulfide under aerobic conditions
A method was developed for the synthesis of 2-acylbenzo[b]thiophenes via a copper-catalyzed sulfuration of 3-(2-iodophenyl)-1-arylpropan-1-ones with K2S.
Copper-catalyzed double C–S bond formation for the synthesis of 2-acyldihydrobenzo[<i>b</i>]thiophenes and 2-acylbenzo[<i>b</i>]thiophenes
作者:Subramani Sangeetha、Govindasamy Sekar
DOI:10.1039/d0cc04647g
日期:——
An efficient domino process is developed for the synthesis of diversely substituted 2,3-dihydrobenzo[b]thiophenes from 2-iodoketones using a Cu-catalyst and easily available xanthate as a sulfur surrogate in good yields. This domino method has been expanded for the synthesis of 2-acylbenzo[b]thiophenes using in situ generated iodine (I2) from by-product KI in high yields. Treatment of xanthate with
开发了一种有效的多米诺方法,该方法使用铜催化剂和易于获得的黄原酸酯作为硫代用品,以高收率从2-碘酮合成各种取代的2,3-二氢苯并[ b ]噻吩。该多米诺法已得到扩展,可利用副产物KI的原位生成的碘(I 2)高产率地合成2-酰基苯并[ b ]噻吩。用铜(II)催化剂处理黄药可能将其还原为铜(I)催化剂,从而启动催化循环。根据XPS分析,碘色测试和其他几个对照实验的结果,提出了一种可能的机制。
[EN] A ONE STEP SYNTHESIS OF 2-SUBSTITUTED BENZO[B]THIOPHENES<br/>[FR] SYNTHÈSE EN UNE ÉTAPE DE BENZO[B]THIOPHÈNES SUBSTITUÉS EN POSITION 2
申请人:INDIAN INST TECH MADRAS
公开号:WO2021038581A1
公开(公告)日:2021-03-04
The invention pertains to a one step synthesis of 2-substituted benzo[b]thiophene of general formula wherein the synthesis of 2-substituted benzo[b]thiophenes is by reacting the starting materials substituted or unsubstituted 2-halogenobenzaldehyde and substituted or unsubstituted acetyl/phenacyl bromide with a catalyst, a sulphur source and phase transfer catalyst in an aqueous medium with atmospheric air and at temperature in the range of 25°C-30°C.
A cascade deprotonation/intramolecular aldol reaction of α-carbonyl sulfonium ylides with 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes to access thieno[2,3-<i>b</i>]indoles and benzothiophenes
The first catalyst-free cascade deprotonation/intramolecular aldol reaction of α-carbonyl sulfoniumylides with 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes was developed. A series of thieno[2,3-b]indoles and benzothiophenes were smoothly obtained in high to excellent yields. The salient features of the protocol include catalyst-free conditions, an environment-friendly solvent, broad
开发了第一个无催化剂的α-羰基sulf烷基化物与2-巯基吲哚-3-甲醛和2-巯基苯甲醛的级联去质子/分子内羟醛反应。可以高收率或优异收率顺利获得一系列噻吩并[2,3- b ]吲哚和苯并噻吩。该方案的显着特征包括无催化剂条件,环境友好的溶剂,广泛的底物范围和大规模合成。