Pd(PPh3)4-catalyzed direct ortho-fluorination of 2-arylbenzothiazoles with an electrophilic fluoride N-fluorobenzenesulfonimide (NFSI)
摘要:
An efficient protocol was developed for regio-selective Pd-catalyzed direct ortho-fluorination of 2-alylbenzo[d]thiazoles using N-fluorobenzenesulfonimide (NFSI) as the F+ source, and L-proline as the crucial promoter. The present method offered a practical route to synthesize valuable fluorinated products, which are of potential importance in the pharmaceutical and agrochemical industries. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
A mild and efficient substrate-assisted CHbond cyanation of 2-arylbenzothiazoles has been developed using CuCN as cyano-group source. The reaction exhibits broad functional groups tolerance giving the desired products in moderate to excellent yields. Regioselective cyanation was in favor of the less sterically hindered position to those meta-substituted substrate.
A Ru-catalyzed meta-selective C-H nitration of 2-arylbenzothiazoles and 2-arylthiazoles has been developed. A wide range of functional groups are tolerated, providing the meta-nitrated products in good to excellent yields using Cu(NO3)2·3H2O as the nitro source. The nitration could be carried out on a gram scale and used for the synthesis of promising therapeutic leads for human African trypanosomiasis
Regioselective ortho-trifluoromethylthiolation of 2-arylbenzo[d]thiazole via tandem substrate-assisted C–H iodination and trifluoromethylthiolation
作者:Puying Luo、Qiuping Ding、Yuanyuan Ping、Jianan Hu
DOI:10.1039/c6ob00005c
日期:——
A mild and efficient tandem benzo[d]thiazole directed C–H iodination and trifluoromethylthiolation for the synthesis ofortho-trifluoromethylthiolated 2-arylbenzo[d]thiazoles have been developed using AgSCF3as a coupling partner.
A mild and efficient Ru-catalyzed ortho-oxidative alkenylation of 2-arylbenzo[d]thiazoles through twofold C-H bond functionalization in aqueous solution of anionic surfactant sodium dodecylbenzenesulfonate (SDBS) has been developed using activated olefins as coupling partner. The protocol could be carried out smoothly on a gram scale, recyclable, and applicable to 2-arylthiazoles.
通过使用活化烯烃作为偶联伙伴,在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的水溶液中通过两倍的CH键官能化,温和有效地Ru催化了2-芳基苯并[ d ]噻唑的Ru催化正氧化烯基化。该方案可以以克为单位平稳地进行,可回收并适用于2-芳基噻唑。
Palladium-catalyzed C–H bond functionalization/oxidative acyloxylation of 2-aryl-benzo[d]thiazoles
A chelation-assisted Pd-catalyzed ortho-acyloxylation reaction of the 2-arylbenzo[d]thiazole is described via sp2 C–H bond activation. A wide substrate scope with good functional group tolerance has been demonstrated, affording mono- or diacyloxylation products in moderate to good yields. This method is an alternative route for the preparation of 2-arylbenzo[d]thiazole derivatives via a C–H activation
通过sp 2 C–H键活化描述了2-芳基苯并[ d ]噻唑的螯合辅助Pd催化邻位酰氧基化反应。已经证明具有良好的官能团耐受性的广泛的底物范围,以中等至良好的产率提供了单或二酰氧基化产物。该方法是通过CH活化机理制备2-芳基苯并[ d ]噻唑衍生物的另一种方法。