Pd(II)-catalyzed ortho arylation of 2-arylbenzothiazoles with aryl iodides via benzothiazole-directed C–H activation
摘要:
A novel and efficient method for the arylation of 2-arylbenzothiazoles is described via C-H activation. The desired C(Ar)-C(Ar) bond formation proceeded efficiently with good functional-group tolerance and high regioselectivity. Proposed mechanism for the arylation of 2-arylbenzothiazole is depicted.
Iron-Promoted Three-Component 2-Substituted Benzothiazole Formation via Nitroarene <i>ortho</i>-C–H Sulfuration with Elemental Sulfur
作者:Qiaoyan Xing、Yanfeng Ma、Hao Xie、Fuhong Xiao、Feng Zhang、Guo-Jun Deng
DOI:10.1021/acs.joc.8b02619
日期:2019.2.1
A three-component procedure for the preparation of 2-substituted benzothiazoles from nitroarenes, alcohols, and sulfur powder is described. The reaction showed a good functional group tolerance to provide the heterocyclic products in moderate to good yields. The sequential assembly involving nitro reduction, C–N condensation, and C–S bond formation has been realized in one pot.
alcohols, heteroaryl halides, and thiourea has been developed for direct and selective synthesis of heteroaryl thioethers. This method can be easily scaled up to the gram scale and extended to dialkyl thioethers, heteroaryl selenides, benzothiazoles, and some antimycobacterially‐active thioethers. Mechanisticstudies revealed that a by‐product‐promoted in situ C–O activation of alcohols to more reactive
Unveiling Photodeactivation Pathways for a New Iridium(III) Cyclometalated Complex
作者:Daniel Escudero、Eike Heuser、Robert J. Meier、Michael Schäferling、Walter Thiel、Elisabeth Holder
DOI:10.1002/chem.201301291
日期:2013.11.11
heteroleptic IrIII complex bearing 6‐fluoro‐2‐phenylbenzo[d]thiazole as cyclometalating ligand and (Z)‐6‐(9H‐carbazol‐9‐yl)‐5‐hydroxy‐2,2‐dimethylhex‐4‐en‐3‐one as ancillary ligand. The photodeactivation mechanisms have been elucidated through extensive density functional theory (DFT) calculations. The active role of metal‐centered (3MC) triplet excited states in the nonradiative deactivation pathways is, for
我们报告了合成的中性杂化Ir III配合物,该配合物带有6-氟-2-苯基苯并[ d ]噻唑作为环金属配体和(Z)-6-(9 H-咔唑-9-基)-5-羟基- 2,2-二甲基六角-4-烯-3-酮作为辅助配体。通过广泛的密度泛函理论(DFT)计算已经阐明了光失活机理。在这种复合物中,首次证实了以金属为中心的(3 MC)三重态激发态在非辐射失活途径中的积极作用。
Photoinduced Heterogeneous C−H Arylation by a Reusable Hybrid Copper Catalyst
Heterogeneouscopper catalysis enabled photoinducedC−Harylations under exceedingly mild conditions at room temperature. The versatile hybridcoppercatalyst provided step‐economical access to arylated heteroarenes, terpenes and alkaloid natural products with various aryl halides. The hybridcoppercatalyst could be reused without significant loss of catalytic efficacy. Detailed studies in terms of
benzothiazole derivatives in high yields was provided via copper catalyzed tandem cyclization with o-haloanilines, elemental sulfur and terminal alkynes as raw materials. In this protocol, C atoms on the CC triplebond were controllably involved in the construction of the benzothiazole framework and multiple carbon–heteroatom bonds through divergent routes.