Preparation of α,β-unsaturated esters and amides via external-CO-free palladium-catalyzed carbonylation of alkenyl tosylates
作者:Tsuyoshi Ueda、Hideyuki Konishi、Kei Manabe
DOI:10.1016/j.tetlet.2012.07.057
日期:2012.9
monoxide nor any pressure-resistant apparatus. A variety of cyclic and acyclic alkenyl tosylates can be converted into the corresponding phenyl esters in good yields. Furthermore, this method is effective for the one-pot synthesis of α,β-unsaturatedamides.
with 2 equiv of aryl Grignardreagents, were found to be effective active catalysts in cross-coupling reactions of vinyl ethers with aryl Grignardreagents, giving rise to the production of vinyl arenes. In this catalytic system, vinyl-O bonds were preferably cleaved over Ar-O or Ar-Br bonds. A lithium rhodate complex was isolated, and its crystalstructure was determined by X-ray crystallography.
通过 [RhCl(cod)]2 与 2 当量的芳基格氏试剂反应生成的阴离子二芳基铑配合物被发现是乙烯基醚与芳基格氏试剂交叉偶联反应的有效活性催化剂,从而产生乙烯基芳烃. 在该催化系统中,乙烯基-O键优选在Ar-O或Ar-Br键上裂解。分离出一种铑酸锂络合物,并通过 X 射线晶体学确定其晶体结构。
Enantioselective Hydroalkenylation of Olefins with Enol Sulfonates Enabled by Dual Copper Hydride and Palladium Catalysis
作者:Alexander W. Schuppe、James Levi Knippel、Gustavo M. Borrajo-Calleja、Stephen L. Buchwald
DOI:10.1021/jacs.1c02117
日期:2021.4.14
The catalytic enantioselective synthesis of α-chiral olefins represents a valuable strategy for rapid generation of structural diversity in divergent syntheses of complex targets. Herein, we report a protocol for the dual CuH- and Pd-catalyzed asymmetric Markovnikov hydroalkenylation of vinyl arenes and the anti-Markovnikov hydroalkenylation of unactivated olefins, in which readily available enol triflates
A phosphorylation of alkenyl and aryl C–O bonds at room temperature via photoredox/nickel dual catalysis is reported. By starting from easily available and inexpensive sulfonates, a variety of important alkenyl phosphonates and aryl phosphine oxides are generated in moderate to excellent yields. This method features mild reaction conditions, high selectivity, good functional group tolerance, wide substrate
Palladium Catalyzed Alkoxy- and Aminocarbonylation of Vinyl Tosylates
作者:Diana C. Reeves、Sonia Rodriguez、Heewon Lee、Nizar Haddad、Dhileepkumar Krishnamurthy、Chris H. Senanayake
DOI:10.1021/ol200744s
日期:2011.5.6
The palladium catalyzed alkoxycarbonylation and aminocarbonylation of vinyl tosylates are described. A variety of ketone and aldehyde derived vinyl tosylates may be carbonylated in the presence of primary, secondary, and tertiary alcohols, or primary and secondary amines, to provide the corresponding esters and amides in good yields. The alkoxycarbonylation was applied to a short synthesis of isoguvacine