Selective C-C Bond Scission of Ketones via Visible-Light-Mediated Cerium Catalysis
作者:Yilin Chen、Jianbo Du、Zhiwei Zuo
DOI:10.1016/j.chempr.2019.11.009
日期:2020.1
catalytic manifold for the selectiveC–Cbond scission of ketones via the exploitation of the ligand-to-metal charge transfer (LMCT) excitation mode. Through a cooperative utilization of Lewis acid catalysis and LMCT catalysis, the C–Cbond of ketones could be selectively and effectively cleaved, enabling the installation of different functionalities at each carbon of the cleaved C–Cbond through a sequential
1-ALKENYLATION ON α-POSITION OF KETONE: PALLADIUM-CATALYZED REACTION OF TIN ENOLATES AND 1-BROMO-1-ALKENES
作者:Masanori Kosugi、Isao Hagiwara、Toshihiko Migita
DOI:10.1246/cl.1983.839
日期:1983.6.5
The reaction of tributyltinenolates, prepared from tributyltin methoxide and enol acetates in situ, with 1-bromo-1-alkenes in the presence of a catalytic amount of PdCl2(o-tolyl3P)2 was found to give the derivatives of allyl ketone in good yields.
Asymmetric Fluorination of α-Branched Cyclohexanones Enabled by a Combination of Chiral Anion Phase-Transfer Catalysis and Enamine Catalysis using Protected Amino Acids
作者:Xiaoyu Yang、Robert J. Phipps、F. Dean Toste
DOI:10.1021/ja500882x
日期:2014.4.9
cycles operating together in a matched sense, high enantioselectivites can be achieved, and we envisage that this dual catalysis method has the potential to be more broadly applicable, given the breadth of enaminecatalysis. It also represents a rare example of chiral enaminecatalysis operating successfully on α-branched ketones, substrates commonly inert to this activation mode.
Asymmetric addition of α-branched cyclic ketones to allenamides catalyzed by a chiral phosphoric acid
作者:Xiaoyu Yang、F. Dean Toste
DOI:10.1039/c5sc04202j
日期:——
Asymmetric addition of unactivated [small alpha]-branched cyclic ketones to allenamides catalyzed by a chiral phosphoric acid catalyst, generates an all-carbon quaternary stereocenter with broad substrate scope and high enantioselectivity.
A method for producing cyclopentadienes which comprises the step of cyclodehydration of an unsaturated carbonyl compound having a specific chemical structures in a vapor phase in the presence of a specific solid acid catalyst. The cyclopentadienes of the invention can be produced in a high yield from inexpensive starting materials through a simplified reaction process and are useful as intermediate compounds for organic synthesis.