Palladium-Catalyzed Allylic Esterification via C–C Bond Cleavage of a Secondary Homoallyl Alcohol
摘要:
Palladium-catalyzed allylic esterifications of secondary homoallyl alcohols with acids via sequential retro-allylation and esterification are demonstrated, affording the corresponding allyl ester in up to 99% yield. The electron effect of the substituent of the secondary alcohol was found to be crucial to the selective C-C bond cleavage.
Protic Acid Immobilized on Solid Support as an Extremely Efficient Recyclable Catalyst System for a Direct and Atom Economical Esterification of Carboxylic Acids with Alcohols
作者:Asit K. Chakraborti、Bavneet Singh、Sunay V. Chankeshwara、Alpesh R. Patel
DOI:10.1021/jo900614s
日期:2009.8.21
reported by direct condensation of equimolar amounts of carboxylic acids with alcohols catalyzed by an easy to prepare catalyst system of perchloricacid immobilized on silicagel (HClO4−SiO2). The direct condensation of aryl, heteroaryl, styryl, aryl alkyl, alkyl, cycloalkyl, and long-chain aliphatic carboxylic acids with primary/secondary alkyl/cycloalkyl, allyl, propargyl, and long-chain aliphatic alcohols
Uncovering the On-Pathway Reaction Intermediates for Metal-Free Atom Transfer Radical Addition to Olefins through Photogenerated Phenalenyl Radical Anion
作者:Paramita Datta、Debojyoti Roy、Divya Jain、Shiv Kumar、Swagata Sil、Anup Bhunia、Jyotishman Dasgupta、Swadhin K. Mandal
DOI:10.1021/acscatal.3c05688
日期:2024.3.1
powerful approach for atom transfer radicaladdition (ATRA) while generating the desired intermediates that are otherwise difficult to access with traditional methods. However, photoredox ATRA with organic photosensitizers is rare, giving an opportunity for metal-free routes to complex organic synthesis. Here, we demonstrate exquisite control of product selectivity for addition reactions of in situ generated
A silver-initiated free-radical intermolecular hydrophosphinylation of unactivated alkenes
作者:Zejiang Li、Fenghua Fan、Zengyan Zhang、Yingxia Xiao、Dong Liu、Zhong-Quan Liu
DOI:10.1039/c5ra04136h
日期:——
A scalable, operationally easy intermolecular hydrophosphinylation of various unactivated alkenes with H–P(O) compoundsviaan Ag(i)-initiated free radical process was developed. Mechanistic studies suggest that atom transfer processes were involved in this system.
Palladium-Catalyzed Allylic Esterification via C–C Bond Cleavage of a Secondary Homoallyl Alcohol
作者:Yong Wang、Qiang Kang
DOI:10.1021/ol501887a
日期:2014.8.15
Palladium-catalyzed allylic esterifications of secondary homoallyl alcohols with acids via sequential retro-allylation and esterification are demonstrated, affording the corresponding allyl ester in up to 99% yield. The electron effect of the substituent of the secondary alcohol was found to be crucial to the selective C-C bond cleavage.