Samarium(II)-mediated spirocyclization by intramolecularaddition of arylradicals onto an aromatic ring was achieved by the reaction of N-(2-iodophenyl)-N-alkylbenzamides with SmI2 in the presence of HMPA, yielding spirocyclic indolin-2-one derivatives. The ether congeners afford spirocyclic benzofuran derivatives in moderate yields by arylradicaladdition onto a benzene ring without having an electron-withdrawing
Cu-catalyzed in situ generation of thiol using xanthate as a thiol surrogate for the one-pot synthesis of benzothiazoles and benzothiophenes
作者:D. J. C. Prasad、G. Sekar
DOI:10.1039/c3ob26915a
日期:——
A new copper-catalyzed in situ generation of aryl thiolates strategy was successfully developed for the one-potsynthesis of substituted benzothiazoles from 2-iodoanilides using xanthate as a thiol precursor. A wide range of 2-iodoanilides with both electron-releasing and electron-withdrawing groups produced the corresponding benzothiazoles in good yields. Further, this one-pot protocol was successfully
成功开发了一种新的铜催化原位生成的芳基硫醇盐策略,该方法可使用以下方法一锅法从2-碘代苯胺合成一取代的苯并噻唑黄药作为硫醇的前体。具有电子释放基团和电子吸收基团的各种2-碘代苯胺以良好的产率产生相应的苯并噻唑。此外,该一锅法协议已成功用于合成有效的抗肿瘤药2-(3,4-二甲氧基苯基)-5-氟苯并[ d ]噻唑(PMX 610)。最后,铜催化原位生成芳基硫醇盐策略成功地用于邻卤代炔基苯的多米诺合成,该方法是使用邻卤代炔基苯黄药 作为硫醇的前体。
Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis
作者:Fengtian Wu、Jie Zhang、Qianbing Wei、Ping Liu、Jianwei Xie、Haojie Jiang、Bin Dai
DOI:10.1039/c4ob02068e
日期:——
An efficient protocol has been developed for the copper-catalysed intramolecular cyclization of N-(2-iodo-/bromo-/chloro-phenyl)benzamides for the synthesis of 2-substituted benzoxazoles.
N-Heterocyclic carbene copper(<scp>i</scp>) complex-catalyzed synthesis of 2-aryl benzoxazoles and benzothiazoles
作者:Julio I. Urzúa、Renato Contreras、Cristian O. Salas、Ricardo A. Tapia
DOI:10.1039/c6ra18510j
日期:——
A new and efficient synthesis of 2-aryl benzoxazoles and benzothiazoles using cooper N-heterocyclic carbene complex is described. In a simple protocol a variety of 2-substituted benzoxazoles and benzothiazoles were obtained...
Synthesis of Benzoxazoles by an Efficient Ullmann-Type Intramolecular C(aryl)-O Bond-Forming Coupling Cyclization with a BINAM-Copper(II) Catalyst
作者:Govindasamy Sekar、Ajay Naidu
DOI:10.1055/s-0029-1218589
日期:2010.2
benzoxazoles were synthesized from the corresponding N-(2-iodophenyl)benzamides through intramolecular C(aryl)-O bond formation via Ullmann-type coupling cyclization in the presence of a catalytic amount of an easily available BINAM-copper(II) complex under very mild reaction conditions (82 ˚C). Less reactive bromo and chloro analogues of the N-(2-halophenyl)benzamides were also successfully cyclized