Metal-Free Oxidative Radical Addition of Carbonyl Compounds to α,α-Diaryl Allylic Alcohols: Synthesis of Highly Functionalized Ketones
作者:Xue-Qiang Chu、Hua Meng、You Zi、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1002/chem.201404463
日期:2014.12.15
A metal‐free directalkylation of simple carbonyl compounds (ketones, esters, and amides) with α,α‐diaryl allylic alcohols is described. The protocol provides facile access to highly functionalized dicarbonyl ketones by a radical addition/1,2‐aryl migration cascade. The regioselectivity of the reaction was precisely controlled by the nature of the carbonyl compound.
Visible-Light-Driven Bisfunctionalization of Unactivated Olefins via the Merger of Proton-Coupled Electron Transfer and Carbene Catalysis
作者:Bei Zhang、Jian-Qing Qi、Yuhan Liu、Zhipeng Li、Jian Wang
DOI:10.1021/acs.orglett.1c03941
日期:2022.1.14
transient radical generation with the only byproduct being N2. Particularly, this radical process employs traditional carbene precursor diazo esters as the radical source, which is the first case in NHC catalysis. Compared to the previous pathway that produces radicals with large discard fragments, this merged channel possesses great atom economy.
在此,我们报道了在多功能合成子重氮酯存在下,N-杂环卡宾 (NHC) 和光共催化的烯烃烷基酰化反应,为仅副产物 N 2 的瞬时自由基生成提供了新思路。特别是,这种自由基过程采用传统的卡宾前体重氮酯作为自由基源,这是 NHC 催化中的第一个案例。与先前产生具有大丢弃碎片的自由基的途径相比,该合并通道具有出色的原子经济性。
Palladium-catalyzed cross-coupling of α-bromocarbonyls and allylic alcohols for the synthesis of α-aryl dicarbonyl compounds
作者:Yang Yu、Uttam K. Tambar
DOI:10.1039/c5sc00505a
日期:——
A palladium-catalyzed coupling of α-bromocarbonyl compounds and allylic alcohols has been developed for the generation of acyclic aryl-substituted dicarbonyl compounds.
Diphenyl-1-(aminoalkyl)-2-piperidinone and -2-pyrrolidinone derivatives
申请人:Fisons Corporation
公开号:US05334720A1
公开(公告)日:1994-08-02
Compounds of the formula I, ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent hydrogen, alkyl, phenyl or substituted phenyl with the proviso that two of R.sub.1, R.sub.2, R.sub.3 or R.sub.4 are phenyl or substituted phenyl and two of R.sub.1, R.sub.2, R.sub.3 or R.sub.4 are hydrogen or alkyl; m represents an integer from 1-2; and n represents an integer from 1-3; or a pharmaceutically acceptable salt thereof. The compounds are useful as pharmaceuticals, in particular, in the treatment of epilepsy.
Investigating the Effect of Lewis Acid Co-catalysts on Photosensitized Visible-Light De Mayo Reactions
作者:Riley M. Kelch、Andrew Whyte、Eunji Lee、Tehshik P. Yoon
DOI:10.1021/acs.orglett.3c01321
日期:2023.6.9
Herein, we describe studies showing that Lewis acid co-catalysts can significantly broaden the scope of alkenes that can be incorporated into the photosensitized visible-light De Mayo reaction. Mechanistic studies suggest that the primary benefit of the Lewis acid is not on substrate sensitization but rather on bond-forming steps downstream of energy transfer, highlighting the diverse effects that