Cooperative Titanocene and Phosphine Catalysis: Accelerated C–X Activation for the Generation of Reactive Organometallics
作者:Lauren M. Fleury、Andrew D. Kosal、James T. Masters、Brandon L. Ashfeld
DOI:10.1021/jo301726v
日期:2013.1.18
transmetalation approach toward the generation of Grignard and organozinc reagents mediated by a titanocene catalyst. This method enables the metalation of functionalized substrates without loss of functional group compatibility. Allyl zinc reagents and allyl, vinyl, and alkyl Grignard reagents were generated in situ and used in the addition to carbonyl substrates to provide the corresponding carbinols in yields
The addition of Grignardreagents to ketones is significantly enhanced by cerium chloride with remarkable suppression of side reactions, particularly enolization. Some esters, which are prone to side reactions, also react readily with Grignardreagents in the presence of cerium chloride to give normal reaction products in reasonable to high yields.
Transfer Vinylation and Dienylation via Rhodium(I)-Catalyzed Deketonation of Allylic Alcohols
作者:Zheng-Qiang Liu、Cheng Liang、Zhen Luo、Yu-Fei Wu、Chuan-Ming Hong、Qing-Hua Li、Tang-Lin Liu
DOI:10.1021/acscatal.2c02325
日期:2022.6.17
bond cleavages of simple allylicalcohols have witnessed tremendous progress in recent years. However, an efficient method for cleaving the C–C bond via β-carbon elimination is still comparatively underexploited. In this study, we demonstrate rhodium(I)-catalyzed deketonative transfer vinylation and transfer dienylation of various tertiary allylicalcohols with ketones via β-vinyl and β-dienyl elimination
Ketyl Radical Generation by Photoexcited Palladium and Development of Organopalladium-Type Reactions
作者:Kosaku Tanaka
DOI:10.1021/acscatal.4c00510
日期:2024.4.5
Enabling reactions of traditional substrates that are inert to Pd catalysts has the potential for further advancements in the field of Pd chemistry. In this study, we developed a method for generating ketyl radicals through the reaction of a photoexcited Pd species with ketones. Upon subsequent reaction with olefins, the ketyl radicals generated through this method yielded Pd-specific reductive and