On the Catalytic Action of Japanese Acid Earth. XI. The Isomerisation of Aldehydes to Ketones and the Explanation of the Migration of the Radicals from the Standpoint of the Electronic Theory (Continued and concluded)
Cobalt(II)-Catalyzed Stereoselective Olefin Isomerization: Facile Access to Acyclic Trisubstituted Alkenes
作者:Sheng Zhang、Deepika Bedi、Lu Cheng、Daniel K. Unruh、Guigen Li、Michael Findlater
DOI:10.1021/jacs.0c02101
日期:2020.5.13
Stereoselective synthesis of trisubstitutedalkenes is a long-standing challenge in organic chemistry, due to the small energy differences between E and Z isomers of trisubstitutedalkenes (compared with 1,2-disubstituted alkenes). Transition metal-catalyzed isomerization of 1,1-disubstituted alkene can serve as an alternative approach to trisubsti-tuted alkenes, but it remains underdeveloped owing
三取代烯烃的立体选择性合成是有机化学中长期存在的挑战,因为三取代烯烃的 E 和 Z 异构体之间的能量差异很小(与 1,2-二取代烯烃相比)。1,1-二取代烯烃的过渡金属催化异构化可以作为三取代烯烃的替代方法,但由于与反应效率和立体选择性有关的问题,它仍然不发达。在这里,我们展示了一种新型钴催化剂可以克服这些挑战,为获得广泛的三取代烯烃提供有效和立体选择性的途径。该协议与单烯和二烯兼容,并表现出良好的官能团耐受性和可扩展性。而且,它已被证明是构建有机发光体和氘代三取代烯烃的有用工具。对该机制的初步研究表明,该反应涉及钴氢化物途径。该反应的高立体选择性归因于 π-π 堆积效应和底物和催化剂之间的空间位阻。
Site-selective carbonylation of arenes<i>via</i>C(sp<sup>2</sup>)–H thianthrenation: direct access to 1,2-diarylethanones
Tatsugi, Jiro; Izawa, Yasuji, Journal of Chemical Research, Miniprint, 1988, # 11, p. 2747 - 2763
作者:Tatsugi, Jiro、Izawa, Yasuji
DOI:——
日期:——
Pd-catalyzed synthesis of α-aryl ketones through couplings of α-arylacetyl chlorides with triarylbismuths as multi-coupling nucleophiles
作者:Maddali L.N. Rao、Somnath Giri、Deepak N. Jadhav
DOI:10.1016/j.tetlet.2009.08.074
日期:2009.11
The cross-coupling reaction of alpha-arylacetyl chlorides with triarylbismuths was studied under Pd-catalyzed conditions. The reaction was found to be facile under the established protocol and furnished high yields of alpha-aryl ketones in short reaction times. This work also demonstrated a facile synthesis of various regio-isomeric mono-, di- and tri-substituted alpha-aryl ketones in high yields. Triarylbisrnuths were employed as sub-stoichiometric multi-coupling organometallic nucleophiles in this coupling protocol. (C) 2009 Elsevier Ltd. All rights reserved.
C−C Bond-Forming Reductive Elimination of Ketones, Esters, and Amides from Isolated Arylpalladium(II) Enolates