Anodic coupling of carboxylic acids to electron-rich double bonds: A surprising non-Kolbe pathway to lactones
作者:Robert J Perkins、Hai-Chao Xu、John M Campbell、Kevin D Moeller
DOI:10.3762/bjoc.9.186
日期:——
Carboxylic acids have been electro-oxidatively coupled to electron-rich olefins to form lactones. Kolbe decarboxylation does not appear to be a significant competing pathway. Experimental results indicate that oxidation occurs at the olefin and that the reaction proceeds through a radical cation intermediate.
Preparation of α-Acyloxy Ketones via Visible-Light-Driven Aerobic Oxo-Acyloxylation of Olefins with Carboxylic Acids
作者:Qing-Bao Zhang、Yong-Liang Ban、Da-Gang Zhou、Pan-Pan Zhou、Li-Zhu Wu、Qiang Liu
DOI:10.1021/acs.orglett.6b02560
日期:2016.10.21
developed a visible-light driven oxo-acyloxylation of aryl alkenes with carboxylic acids and molecular oxygen. A metal-free photoredox system, consisting of an acridinium photocatalyst, an organic base, and molecular sieve (MS) 4 Å, promotes chemoselective aerobic photooxidation of aryl alkenes. This approach may provide a green, practical, and metal-free protocol for a wide range of α-acyloxy ketones.
Efficient Method for Preparing Functionalized Benzosuberenes
申请人:Pinney Kevin G.
公开号:US20120130129A1
公开(公告)日:2012-05-24
The disclosed process can efficiently synthesize functionalized benzosuberenes. The process provides an improved method of production of benzosuberene and compounds containing a benzosuberene moiety, which is characterized by a ring closing methodology comprising reaction of a 5-phenylpentanoic acid with Eaton's reagent to form the benzosuberone. The process, optionally, further includes steps for adding a functional group at the ketone position.
A highly enantioselective approach towards 2-substituted 3-bromopyrrolidines
作者:Jie Chen、Ling Zhou、Ying-Yeung Yeung
DOI:10.1039/c2ob25327e
日期:——
A facile and highly enantioselective approach towards 2-substituted 3-bromopyrrolidines has been developed. The process involves an amino-thiocarbamate catalyzed bromoaminocyclization of 1,2-disubstituted olefinic amides. The pyrrolidine products could readily be converted into other useful building blocks including a dihydropyrrole and a 2-substituted pyrrolidine.
A catalytic enantioselective bromocyclization of olefinic amides using amino-thiocarbamates as the catalysts has been developed. The resulting enantioenriched 2-substituted 3-bromopiperidines can readily be transformed to 3-substituted piperidines through a silver salt-mediated rearrangement. This process has been applied to the synthesis of a dopaminergic drug, Preclamol.