Synthesis of C9,C10-Diheteroarylated Phenanthrenes via Palladium-Catalyzed C-H Bond Activation
作者:Bilel Bouzayani、Ridha Ben Salem、Jean-François Soulé、Henri Doucet
DOI:10.1002/ejoc.201800533
日期:2018.12.2
Successive palladium‐catalyzed direct heteroarylations of 9‐ and 10‐bromophenanthrenes provides a convenient route for access to symmetrical and non‐symmetrical 9,10‐di(heteroarylated) phenanthrenes. A wide variety of heteroarenes such as thiazoles, (benzo)thiophenes, (benzo)furans, pyrroles, selenophenes, or imidazopyridazines was successfully employed.
Base-Mediated Intermolecular sp<sup>2</sup> C−H Bond Arylation via Benzyne Intermediates
作者:Thanh Truong、Olafs Daugulis
DOI:10.1021/ja200184b
日期:2011.3.30
A transition-metal-free method for arylation of heterocycle and arene carbon-hydrogen bonds by aryl chlorides and fluorides has been developed. The reactions proceed via aryne intermediates and are highly regioselective with respect to the C-H bond coupling component.
A palladium NNC-pincer complex efficiently catalyzed the direct arylation of thiophene derivatives with extremely low palladium loadings of the order of parts per million. Thus, the reaction of various thiophenes with aryl bromides in the presence of 25–100 mol ppm of chlorido[(2-phenyl-κ-C 2)-9-phenyl-1,10-phenanthroline-κ2-N,N′]palladium(II) NNC-pincer complex, K2CO3, and pivalic acid in N,N-dimethylacetamide
General Method for Functionalized Polyaryl Synthesis via Aryne Intermediates
作者:Thanh Truong、Milad Mesgar、Ky Khac Anh Le、Olafs Daugulis
DOI:10.1021/ja504886x
日期:2014.6.18
complements transition-metal-catalyzed direct arylation and allows access to structures that are not easily accessible via other direct arylation methods. The reactions are highly functional-group tolerant, with alkene, ether, dimethylamino, trifluoromethyl, ester, cyano, halide, hydroxyl, and silyl functionalities compatible with reaction conditions.
Synthesis of Functionalized Phenanthrenes via Regioselective Oxidative Radical Cyclization
作者:Kamalkishore Pati、Christopher Michas、David Allenger、Ilya Piskun、Peter S. Coutros、Gabriel dos Passos Gomes、Igor V. Alabugin
DOI:10.1021/acs.joc.5b01014
日期:2015.12.4
preparation of fully conjugated molecules. In this work, we report an oxidatively terminated Bu3Sn-mediated cyclization of an alkyne where AIBN, the commonly used initiator, takes on a new function as an oxidative agent. Sn-mediated radical transformation of biphenyl aryl acetylenes into functionalized phenanthrenyl stannanes can be initiated via two potentially equilibrating vinyl radicals, one of which can