Thermodynamic and kinetic acidity properties of nitroalkanes. Correlation of the effects of structure on the ionization constants and the rate constants of neutralization of substituted 1-phenyl-1-nitroethanes
An asymmetric sp3–sp3 cross-electrophile coupling using ‘ene’-reductases
作者:Haigen Fu、Jingzhe Cao、Tianzhang Qiao、Yuyin Qi、Simon J. Charnock、Samuel Garfinkle、Todd K. Hyster
DOI:10.1038/s41586-022-05167-1
日期:2022.10.13
XEC between alkyl halides and nitroalkanes catalyzed by flavin-dependent ‘ene’-reductases. Photoexcitation of the enzyme-templated charge-transfer complex between an alkyl halide and flavin cofactor enables the chemoselective reduction of alkyl halide over the thermodynamically favored nitroalkane partner. The key C–C bond-forming step occurs via the reaction of an alkyl radical with an in situ generated
Asymmetric <i>C</i>-Alkylation of Nitroalkanes <i>via</i> Enzymatic Photoredox Catalysis
作者:Haigen Fu、Tianzhang Qiao、Jose M. Carceller、Samantha N. MacMillan、Todd K. Hyster
DOI:10.1021/jacs.2c12197
日期:2023.1.18
Tertiary nitroalkanes and the corresponding α-tertiary amines represent important motifs in bioactive molecules and natural products. The C-alkylation of secondary nitroalkanes with electrophiles is a straightforward strategy for constructing tertiary nitroalkanes; however, controlling the stereoselectivity of this type of reaction remains challenging. Here, we report a highly chemo- and stereoselective
Herein, we present an efficient and practical method for the synthesis of α-arylated nitroalkanes through palladium-catalyzed cross-coupling of nitroalkanes and phenol derivatives under mild conditions. The key to this success lies in using BrettPhos as a ligand. Compared with the known methods, this method is more novel and environmentally friendly by usingphenol derivatives acting as arylating reagents
Synthesis of 5-alkyl-5-aryl-γ-lactams from 1-aryl-substituted nitroalkanes and methyl acrylate via Michael addition and reductive lactamization
作者:Jingjing Xu、Xingyao Li、Jinlong Wu、Wei-Min Dai
DOI:10.1016/j.tet.2014.04.074
日期:2014.6
A general method for accessing 5-alkyl-5-aryl-gamma-lactams has been developed using readily available aryl bromides, nitroalkanes, and methyl acrylate as the starting materials. The palladium-catalyzed arylation of nitroalkanes gave the 1-aryl-substituted nitroalkanes, which underwent the DBU-mediated Michael addition with methyl acrylate at room temperature to afford the methyl 4-aryl-4-nitroalkanoates. The latter were then subjected to the nitro reduction using NaBH4-NiCl2 center dot 6H(2)O in MeOH at 0 degrees C to furnish, after treatment with aqueous K2CO3 at room temperature, the 5-alkyl-5-aryl-gamma-lactams in good to excellent overall yields. Selected examples of N-alkylation of the gamma-lactams were also illustrated. (C) 2014 Elsevier Ltd. All rights reserved.
KURZ, M. E.;NGOVIWATCHAI, PREECHA;TANTRARANT, TOSAPORN, J. ORG. CHEM., 1981, 46, N 23, 4668-4672
作者:KURZ, M. E.、NGOVIWATCHAI, PREECHA、TANTRARANT, TOSAPORN