The viability of solid-supported boronic acids as reagents for Suzuki couplings and nucleophilic additions to aldehydes and enones was successfully demonstrated. This metal-catalyzed cleavage strategy allows the synthesis of a series of functionalized biphenyl products, benzylic alcohols, and beta-substituted ketones.
Anionic Four-Electron Donor-Based Palladacycles as Catalysts for Addition Reactions of Arylboronic Acids with α,β-Unsaturated Ketones, Aldehydes, and α-Ketoesters
作者:Ping He、Yong Lu、Cheng-Guo Dong、Qiao-Sheng Hu
DOI:10.1021/ol062814b
日期:2007.1.1
acids with aldehydes and alpha-ketoesters are described. Our study demonstrated that palladacycles were highlyefficient, practical catalysts for these addition reactions. The work described here not only opened a new paradigm for the application of palladacycles, but may also pave the road for other metalacycles as practically useful catalysts for such addition reactions including asymmetric ones. [reaction:
commercially available aldehydes (ketones) and benzylic alcohols can be readily arylated to provide a general and scalable access to structurally diverse alcohols (97 examples, >10 gram‐scale). More importantly, convergentpairedelectrolysis, the ideal but challenging electrochemical technology, was employed to transform low‐value alcohols into more useful alcohols. Detailed mechanism study suggests that two
Highly inert to ionic additions to aldehydes, aryl- and 1-alkenylboronic acids succumb to a catalytic variant mediated by a [Rh(acac)(CO)2 ]-diphosphane complex in aqueous phase at 80-95°C to yield secondary alcohols [Eq. (a)]. A key step in the catalytic cycle is the transmetalation between the boron reagent and the rhodium complex. Ln =diphosphane (e.g. 1,1'-bis(diphenylphosphanyl)ferrocene); R=aryl
Visible-Light-Triggered Directly Reductive Arylation of Carbonyl/Iminyl Derivatives through Photocatalytic PCET
作者:Ming Chen、Xinxin Zhao、Chao Yang、Wujiong Xia
DOI:10.1021/acs.orglett.7b01677
日期:2017.7.21
cross-coupling strategy that enables the direct arylation of carbonyl/iminyl derivatives in the presence of Et3N has been realized. Such an atom-economical protocol furnishes a broad scope of arylation products such as secondary/tertiary alcohols and amines via a PCET process that facilitates the challenging reduction of C═X (X = O, N). Mechanisticinvestigation indicates two photocatalytic redox cycles