methods for the introduction of CF2H into heteroarenes. Herein we disclose a new strategy for the direct introduction of a difluoromethyl group into heteroarenes via the copper-mediated C-H oxidative difluoromethylation of heteroarenes with TMSCF2H. This mild and regioselective method enables the convenient synthesis of a range of difluoromethylated heteroarenes in high yields. The usage of 9,10-phenanthrenequinone
Design and development of POCN-pincer palladium catalysts for C–H bond arylation of azoles with aryl iodides
作者:Shrikant M. Khake、Vineeta Soni、Rajesh G. Gonnade、Benudhar Punji
DOI:10.1039/c4dt01547a
日期:——
complex 2a efficiently catalyzes the C–Hbondarylation of benzothiazole, substituted-benzoxazoles and 5-aryl oxazoles with diverse aryl iodides in the presence of CuI as a co-catalyst under mild reaction conditions. This represents the first example of a pincer palladium complex being applied for the direct C–Hbondarylation of any heterocycle with low catalyst loading. A preliminary mechanistic investigation
已经开发出定义明确且有效的POCN连接的钯络合物,用于将唑类与芳基碘化物直接进行C–H键芳基化。的膦酸酯-胺配体钳形1-(R 2 PO)-C 6 H ^ 4 -3-(CH 2 Ñ我镨2)[ R 2 POCN IPR2 -H; R = i Pr(1a),R = t Bu(1b)]和相应的钯配合物2-(R 2 PO)-C 6 H 3 -6-(CH 2 N i Pr 2)} PdCl [(R2 POCN iPr2氯化钯; R = i Pr(2a),R = t Bu(2b)]以高收率合成。用KI和AgOAc处理钯配合物2a分别得到配合物(iPr2 POCN iPr2)PdI(3a)和(iPr2 POCN iPr2)Pd(OAc)(4a)。类似地,2a与苯并噻唑基-锂的反应以定量收率产生了(iPr2 POCN iPr2)Pd(苯并噻唑基)(5a)络合物。夹钯复合物2a在CuI作为助催化剂的条件下,
Rhodium/Copper Cocatalyzed Highly <i>trans</i>-Selective 1,2-Diheteroarylation of Alkynes with Azoles via C–H Addition/Oxidative Cross-Coupling: A Combined Experimental and Theoretical Study
作者:Guangying Tan、Lei Zhu、Xingrong Liao、Yu Lan、Jingsong You
DOI:10.1021/jacs.7b07242
日期:2017.11.8
experimental and theoretical methods, the reaction mechanism for addition/oxidative cross-coupling of internal alkynes with azoles has been investigated. Theoretical calculations reveal that the metalation/deprotonation of azole could occur with either rhodium or copper species. When azolylrhodium is formed, an alkyne could insert into the Rh–C bond. Another azolyl group could then transfer to rhodium from azolylcopper
catalyzed, CuII-mediated thiolation reaction between heteroarenes and thiols was achieved with good yield under base-free conditions. DMSO could serve as an effective methylthiolation reagent for the synthesis of heterocyclic methyl thioethers.
Copper-catalyzeddirectC–H fluoroalkenylation of heterocycles using various gem-bromofluoroalkenes as electrophiles is reported. This efficient method offers step-economical, low-cost and stereocontrolled access to relevant heteroarylated monofluoroalkenes. The synthesis of fluorinated analogues of biomolecules and therapeutic agents for the treatment of Duchenne muscular dystrophy as application