Synthesis of Ketones and Esters from Heteroatom-Functionalized Alkenes by Cobalt-Mediated Hydrogen Atom Transfer
作者:Xiaoshen Ma、Seth B. Herzon
DOI:10.1021/acs.joc.6b01709
日期:2016.10.7
Cobalt bis(acetylacetonate) is shown to mediate hydrogen atom transfer to a broad range of functionalized alkenes; in situ oxidation of the resulting alkylradical intermediates, followed by hydrolysis, provides expedient access to ketones and esters. By modification of the alcohol solvent, different alkyl ester products may be obtained. The method is compatible with a number of functional groups including
A nickel(II)/silver(I)-catalyzedtandem C(sp2)–H activation and intramolecular annulation of arenes with dibromoalkenes has been successfully achieved, which offers an efficient approach to the 3-methyleneisoindolin-1-one scaffold. Attractive features of this system include its low cost, ease of operation, and its ability to access a wide range of isoindolinones.
镍( II )/银( I )催化的串联C(sp 2 )-H 活化和芳烃与二溴烯烃的分子内环化已成功实现,这为3-亚甲基异吲哚啉-1-one 支架提供了一种有效的方法。该系统的吸引人的特点包括其低成本、易于操作,以及它能够获得广泛的异吲哚啉酮。
Construction of Phenanthrenes and Chrysenes from β-Bromovinylarenes via Aryne Diels–Alder Reaction/Aromatization
作者:Vikram Singh、Ram Subhawan Verma、Anil K. Khatana、Bhoopendra Tiwari
DOI:10.1021/acs.joc.9b01644
日期:2019.11.1
A highly efficient transition-metal-free general method for the synthesis of polycyclic aromatic hydrocarbons like phenanthrenes and chrysenes (and tetraphene) from β-bromovinylarenes and arynes has been developed. The reactions proceed via an aryne Diels-Alder (ADA) reaction, followed by a facile aromatization. This is the first report on direct construction of chrysenes (and tetraphene) using the
A Sequential Metal-Catalyzed C−N Bond Formation in the Synthesis of 2-Amido-indoles
作者:Pei-Yuan Yao、Yu Zhang、Richard P. Hsung、Kang Zhao
DOI:10.1021/ol801711p
日期:2008.10.2
A sequential metal-catalyzed C-N bond formation employing ortho-haloaryl acetylenic bromides is described. The initial amidation is highly selective for C-sp-N bond formation, leading to o-haloaryl-substituted ynamides that can be useful building blocks, while the overall sequence provides a facile construction of 2-amido-indoles.