Silver-catalyzed Double Decarboxylative Radical Alkynylation/Annulation of Arylpropiolic Acids with α-keto Acids: Access to Ynones and Flavones under Mild Conditions
Ynones are privileged buildingblocks in various organic syntheses of heterocyclicderivatives due to their multifunctional nature, and flavones are an important class of natural products with a wide range of biological activities. We describe the catalytic double decarboxylative alkynylation of arylpropiolic acids with α‐keto acids. With Ag(I)/persulfate as the catalysis system, the valuable ynones
Sodium Methyl Carbonate as an Effective C1 Synthon. Synthesis of Carboxylic Acids, Benzophenones, and Unsymmetrical Ketones
作者:Timothy E. Hurst、Julie A. Deichert、Lucas Kapeniak、Roland Lee、Jesse Harris、Philip G. Jessop、Victor Snieckus
DOI:10.1021/acs.orglett.9b00773
日期:2019.6.7
Reported is the synthesis of carboxylicacids, symmetrical ketones, and unsymmetrical ketones with selectivity achieved by exploiting the differential reactivity of sodium methyl carbonate with Grignard and organolithium reagents.
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
Decarboxylative Oxyacyloxylation of Propiolic Acids: Construction of Alkynyl-Containing α-Acyloxy Ketones
作者:Xin Chen、Yangchun Xin、Zhi-Wei Zhao、Yu-Jian Hou、Xiang-Xiang Wang、Wen-Jin Xia、Ya-Min Li
DOI:10.1021/acs.joc.1c00669
日期:2021.6.18
Novel decarboxylative oxyacyloxylation of propiolic acids has been developed. This reaction provides an efficient access to alkynyl-containing α-acyloxy ketones from readily available starting materials and exhibits significant functional group tolerance. Furthermore, oxyacyloxylation of terminal alkynes and aliphatic propiolic acids was also developed. A possible reaction mechanism is proposed based
An efficient gold-catalyzedcyclization/arylidene group transfer cascade reaction of N-propioloyl hydrazones has been developed. This method provides a novel approach for the synthesis of various functionalized 4-arylidenepyrazolones.