C (sp3) -H 键的直接和可控氧化的发展非常重要。在此,公开了在无金属反应条件下碘催化的(芳基)(杂芳基)甲烷到(芳基)(杂芳基)甲醇的可控氧化。在二甲亚砜存在下,由碘/甲硅烷基氯和 HI 作为添加剂组成的催化体系选择性地氧化 C (sp3) -H 键,而不会过度氧化成相应的酮。以良好的收率获得了治疗上重要的芳基杂芳基甲醇衍生物。初步机理研究证明氧气的主要来源是DMSO。
Palladium-Catalyzed Decarboxylative Couplings of 2-(2-Azaaryl)acetates with Aryl Halides and Triflates
作者:Rui Shang、Zhi-Wei Yang、Yan Wang、Song-Lin Zhang、Lei Liu
DOI:10.1021/ja107103b
日期:2010.10.20
Pd-catalyzed decarboxylative cross-couplings of 2-(2-azaaryl)acetates with arylhalides and triflates have been discovered. This reaction is potentially useful for the synthesis of some functionalized pyridines, quinolines, pyrazines, benzoxazoles, and benzothiazoles. Theoretical analysis shows that the nitrogen atom at the 2-position of the heteroaromatics directly coordinates to Pd(II) in the decarboxylation
Efficient Selenium-Catalyzed Selective C(sp<sup>3</sup>)−H Oxidation of Benzylpyridines with Molecular Oxygen
作者:Weiwei Jin、Poonnapa Zheng、Wing-Tak Wong、Ga-Lai Law
DOI:10.1002/adsc.201601065
日期:2017.5.2
An efficient selenium‐catalyzed direct oxidation of benzylpyridines in aqueous DMSO has been successfully developed by using molecularoxygen as the oxidant. A variety of benzoylpyridines with broad functional group tolerance were obtained in modest to excellent yields and with exclusive chemoselectivity.
moieties was provided through cross-coupling reactions of aryl bromides or benzyl halides with heteroarylaluminum reagents in the presence of Pd(OAc)2 and (o-tolyl)3P. The coupling reaction also worked efficiently with heteroaryl bromides affording series of heterobiaryl compounds. The reaction of phenylbromide with in situ prepared 3-pyridyl aluminum was demonstrated to afford the product 8a in high yield