One-Pot Three-Component Catalytic Synthesis of Fully Substituted Pyrroles from Readily Available Propargylic Alcohols, 1,3-Dicarbonyl Compounds and Primary Amines
作者:Victorio Cadierno、José Gimeno、Noel Nebra
DOI:10.1002/chem.200701132
日期:——
preparation of fully substituted pyrroles, from readily accessible secondary propargylic alcohols, 1,3-dicarbonylcompounds and primary amines, has been developed. The one-pot multicomponent reaction, which is catalysed by the system [Ru(eta(3)-2-C(3)H(4)Me)(CO)(dppf)][SbF(6)]/CF(3)CO(2)H (dppf: 1,1'-bis(diphenylphosphanyl)ferrocene), involves initial propargylation of the 1,3-dicarbonylcompound promoted by
Several tetrasubstituted NH pyrroles, functionalized with ester or ketone groups at C-3 position, were prepared by one-pot coupling of secondarypropargylicalcohols with 1,3-dicarbonylcompounds and tert-butyl carbamate, via in situ deprotection of the corresponding pentasubstituted N-Boc pyrroles. The three-component coupling process was promoted by the combined use of the 16-electron ruthenium(II)
Chemo‐Enzymatic Synthesis of Pyrazines and Pyrroles
作者:Jin Xu、Anthony P. Green、Nicholas J. Turner
DOI:10.1002/anie.201810555
日期:2018.12.17
Herein we report the biocatalytic synthesis of substituted pyrazines and pyrroles using a transaminase (ATA) to mediate the key amination step of the ketone precursors. Treatment of α-diketones with ATA-113 in the presence of a suitable amine donor yielded the corresponding α-amino ketones which underwent oxidative dimerization to the pyrazines. Selective amination of α-diketones in the presence of