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.
Synthesis of Aryl(di)azinyl Ketones through Copper- and Iron-catalyzed Oxidation of the Methylene Group of Aryl(di)azinylmethanes
作者:Johan De Houwer、Kourosch Abbaspour Tehrani、Bert U. W. Maes
DOI:10.1002/anie.201108540
日期:2012.3.12
Sustainable Oxidations: An oxidation method to transform aryl(di)azinylmethanes into aryl(di)azinylketones is described. Base metals (copper and iron) as catalysts in combination with O2 as the oxidant are used, which makes this method sustainable. The utility of this method is illustrated by the synthesis of 6‐(4‐methylbenzoyl)pyridine‐2‐carbaldehyde, which is an intermediate in the preparation of
A Nitrogen-Assisted One-Pot Heteroaryl Ketone Synthesis from Carboxylic Acids and Heteroaryl Halides
作者:Krystyna Demkiw、Hirofumi Araki、Eric L. Elliott、Christopher L. Franklin、Yoonjoo Fukuzumi、Frederick Hicks、Kazushi Hosoi、Tadashi Hukui、Yoichiro Ishimaru、Erin O’Brien、Yoshimasa Omori、Masahiro Mineno、Hideya Mizufune、Naotaka Sawada、Yasuhiro Sawai、Lei Zhu
DOI:10.1021/acs.joc.6b00194
日期:2016.4.15
A practical and highly effective one-pot synthesis of versatile heteroaryl ketones directly from carboxylic acids and heteroaryl halides under mild conditions is reported. This method does not require derivatization of carboxylic acids (preparation of acid chlorides, Weinreb amides, etc.) or the use of any additives/catalysts. A wide substrate scope of carboxylic acids with high functional group tolerance
A facile synthetic route for 2-pyridyl derivatives: direct preparation of a stable 2-pyridylzinc bromide and its copper-free and pd-catalyzed coupling reactions
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tetlet.2009.07.004
日期:2009.9
Direct preparation of 2-pyridylzinc bromide has been developed. Interestingly, the subsequent coupling reactions with acid chlorides have been carried out without any transition metal catalyst. 2-Pyridylaryl compounds, symmetrical and unsymmetrical 2,2′-bipyridines were also successfully obtained from palladium-catalyzed coupling reactions of 2-pyridylzinc bromide under mild conditions.
2-Pyridyl and 3-pyridylzinc bromides: direct preparation and coupling reaction
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tet.2010.02.061
日期:2010.4
A facile synthetic approach to the direct preparation of 2-pyridyl and 3-pyridylzinc bromides has been demonstrated usingRieke zinc with 2-bromopyridine and 3-bromopyridine, respectively. A variety of different electrophiles have been coupled with the resulting organozinc reagents to give the corresponding cross-coupling products in moderate to good yields.