Semireduction of alkynoic acids via a transition metal-free α borylation-protodeborylation sequence
作者:Astha Verma、R. Justin Grams、Brett P. Rastatter、Webster L. Santos
DOI:10.1016/j.tet.2019.02.030
日期:2019.4
A method for the semi-reduction of alkynoicacids through an α-borylation and subsequent protodeborylation mechanism has been developed. The transition metal-free protocol is achieved through the activation of bis(pinacolato)diboron by an in situ generated carboxylate moiety yielding aryl acrylic acids. Our studies demonstrate an unprecedented dual role for the carboxylate anion that involves the activation
Efficient and Reusable CuI/1,10-Phenanthroline-Catalyzed Oxidative Decarboxylative Homocoupling of Arylpropiolic Acids in Aqueous DMF
作者:De-Xian Liu、Fei-Long Li、Hong-Xi Li、Wei-Jie Gong、Jun Gao、Jian-Ping Lang
DOI:10.1002/ejoc.201402416
日期:2014.8
An efficient method for synthesis of 1,3-diynes through the CuI/1,10-phenanthroline-catalyzedoxidativedecarboxylativehomocoupling of aryl pioprolic acids in aqueousDMF has been developed. The catalytic system was suitable for a variety of arylpropiolicacids, and the corresponding 1,3-diynes could be prepared in high yields. The catalytic system was recovered from the organic products by filtration
Copper-Catalyzed Oxidative Decarboxylative Couplings of Sulfoximines and Aryl Propiolic Acids
作者:Daniel L. Priebbenow、Peter Becker、Carsten Bolm
DOI:10.1021/ol403106e
日期:2013.12.20
A method has been developed for the preparation of N-alkynylated sulfoximines involving the copper-catalyzeddecarboxylativecoupling of sulfoximines with aryl propiolic acids. A range of substituents on both the sulfoximidoyl moiety and the aryl group of the propiolic acid were compatible with this reaction process to afford a series of sulfoximidoyl-functionalized alkynes.
Copper-Catalyzed Decarboxylative Atom Transfer Radical Addition of Iododifluoroacetate to Alkynyl Carboxylic Acids
作者:Gang Li、Yi-Xuan Cao、Chen-Guang Luo、Yi-Ming Su、Yan Li、Quan Lan、Xi-Sheng Wang
DOI:10.1021/acs.orglett.6b02216
日期:2016.10.7
copper-catalyzed decarboxylative atomtransferradicaladdition of alkynyl carboxylic acids has been developed with a readily available fluoroalkyl halide. This novel protocol has demonstrated a unique difunctionalization of nonterminal alkynes with a broad substrate scope and excellent functional-group tolerance. Mechanistic investigations revealed that the catalytic cycle was initiated by the attack of