A RhIII‐catalyzed C–H activation/cyclativecaptureapproach, involving a nucleophilic addition of C(sp3)–Rh species to polarized double bonds is reported. This constitutes the first intermolecular catalytic method to directly access 1‐aminoindolines with a broad substituent scope under mild conditions.
CuI/4-Hydro-<scp>l</scp>-proline as a More Effective Catalytic System for Coupling of Aryl Bromides with <i>N</i>-Boc Hydrazine and Aqueous Ammonia
作者:Liqin Jiang、Xu Lu、Hui Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo9006738
日期:2009.6.19
CuI/4-hydroxy-l-proline-catalyzed coupling of aryl bromides and N-Boc hydrazine takes place in DMSO at 80 °C to give N-aryl hydrazides. When aryl iodides are employed, this reaction completes at 50 °C and no ligand is required. Under the catalysis of CuI/4-hydroxy-l-proline, the coupling reaction of aqueousammonia with aryl bromides proceeds smoothly at 50 °C to afford primary arylamines. In this
CuI / 4-羟基-1-脯氨酸催化的芳基溴化物与N- Boc肼的偶合反应在DMSO中于80°C进行,得到N-芳基酰肼。当使用芳基碘化物时,该反应在50℃下完成并且不需要配体。在CuI / 4-羟基-1-脯氨酸的催化下,氨水与芳基溴化物的偶联反应在50℃下顺利进行,得到伯芳基胺。在这种情况下,发现K 2 CO 3是比Cs 2 CO 3更好的碱。这些过程允许组装N带有多种官能团的-芳基酰肼和伯芳基胺包括羟基,胺基,三氟甲基,酯基,硝基和酮。
Novel, Efficient and Regiospecific Alkylation/Arylation/Heteroarylation of Unsymmetrical Azo Compounds
作者:Uno Mäeorg、Olga Tšubrik、Rannar Sillard
DOI:10.1055/s-2006-926331
日期:——
Excellent regioselectivity is observed in the addition of diverse organometallic nucleophiles to unsymmetricalazocompounds. Primary/secondary/tertiary alkyl, aryl and heteroaryl substituents were introduced this way in high yields.
Synthesis of Cinnolines and Cinnolinium Salt Derivatives by Rh(III)-Catalyzed Cascade Oxidative Coupling/Cyclization Reactions
作者:Yanwei Wang、Bin Li、Baiquan Wang
DOI:10.1021/acs.joc.8b01548
日期:2018.9.21
A novel method for the synthesis of cinnolines and cinnolinium salt derivatives via Rh(III)-catalyzed cascade oxidative coupling/cyclizationreaction from Boc-arylhydrazines and alkynes has been developed. The reactions have a broad substrate scope and high stereoselectivity with readily available starting materials and provides an efficient synthetic route for this kind of compounds. A catalytically
A redox‐neutral cobalt(III)‐catalyzed synthetic approach for the direct synthesis of unprotected indoles showcasing an N−Nbondcleavage is reported. The herein newly introduced Boc‐protected hydrazines establish a beneficial addition to the limited portfolio of oxidizing directing groups for cobalt(III) catalysis. Moreover, the developed catalytic methodology tolerates a good variety of functional