Cationic chiral Au(I) complexes catalyze asymmetric Pictet-Spenglerreactions between tryptamines and arylaldehydes. The resulting tetrahydro-β-carbolines are obtained with wide functional group tolerance in high yield and with high enantioselectivities (up to 95%). Aldehydes bearing polar or protic functions are well tolerated. The reaction features a hitherto unknown C2-auration of the indole as
Potassium Superoxide as an Alternative Reagent for Winterfeldt Oxidation of β-Carbolines
作者:Weiqin Jiang、Xuqing Zhang、Zhihua Sui
DOI:10.1021/ol0271279
日期:2003.1.1
Potassiumsuperoxide was examined as an alternative oxidation reagent for the Winterfeldt reaction. KO(2) was found to be superior to the original Winterfeldt protocol for base-sensitive substrates. [reaction--see text]
Ruthenium Catalyzed Tandem Pictet–Spengler Reaction
作者:Anju Nalikezhathu、Valeriy Cherepakhin、Travis J. Williams
DOI:10.1021/acs.orglett.0c01485
日期:2020.7.2
catalyzed tandem alcohol amination/Pictet–Spengler reaction sequence to synthesize tetrahydro-β-carbolines from an alcohol and tryptamine. Our conditions use a Lewis acid cocatalyst, In(OTf)3, that is compatible with typically base catalyzed amination and an acid catalyzed Pictet–Spengler cyclization. This method proceeds well with benzylicalcohols, heterocyclic carbinols, and aliphatic alcohols. We also
Employing TBN/TEMPO as the catalysts and oxygen as the oxidant, the biologically and pharmaceutically significant tetrahydro-β-carboline and β-carboline alkaloid scaffolds that used to be obtained by multi-step processes can now be selectively obtained in only one-step via direct aerobicoxidative Pictet–Spengler reactions of tryptamines with alcoholsundermildconditions, with water generated as
Synthesis and Investigation of Tetrahydro-β-carboline Derivatives as Inhibitors of the Breast Cancer Resistance Protein (ABCG2)
作者:Anna Spindler、Katja Stefan、Michael Wiese
DOI:10.1021/acs.jmedchem.6b00035
日期:2016.7.14
fumitremorgin C (FTC), Ko143, and the alkaloid harmine, which contain a tetrahydro-β-carboline or β-carboline backbone, respectively. However, toxicity and or instability prevent their use in vivo. Therefore, there is a need for further potent inhibitors. We synthesized and pharmacologically investigated 37 tetrahydro-β-carbolinederivatives. The inhibitory activity of two compounds (51, 52) is comparable