Synthesis of the Precursor of Anti-Inflammatory Agents by Cross-Coupling Using Electrogenerated Highly Reactive Zinc
作者:Masao Tokuda、Aishah A. Jalil、Nobuhito Kurono
DOI:10.1055/s-2002-35978
日期:——
Highlyreactive zine metal was readily prepared by electrolysis of a DMF solution containing naphthalene and a supporting electrolyte in a one-compartment cell fitted with a platinum cathode and a zinc anode. This reactivezinc was used for efficient transformation of ethyl 2-bromoacrylate into the corresponding organozinc compound, which was reacted with various aryl iodides in the presence of palladium
α‐Thianthrenium Carbonyl Species: The Equivalent of an α‐Carbonyl Carbocation
作者:Hao Jia、Tobias Ritter
DOI:10.1002/anie.202208978
日期:2022.9.26
We report α-thianthrenium carbonyl species as α-carbonyl carbocation equivalents, generated in situ by radical conjugate addition of trifluoromethyl radical to Michael acceptors. The method can obtain Cα-tetrasubstituted amino acids in 90 seconds.
Enantioselective Enolate Protonation in Sulfa–Michael Addition to α-Substituted <i>N</i>-Acryloyloxazolidin-2-ones with Bifunctional Organocatalyst
作者:Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol202808n
日期:2011.12.16
Organocatalytic conjugate addition of thiols to α-substituted N-acryloyloxazolidin-2-ones followed by asymmetric protonation has been studied in the presence of cinchona alkaloid derived thioureas. Both of the enantiomers are accessible with the same level of enantioselectivity using pseudoenantiomeric quinine/quinidine derived catalysts. The addition/protonation products have been converted to useful biologically