regioselective intermolecular 1,2‐aryl‐aminoalkylation of alkenes by photoredox/nickel dual catalysis is described here. This three‐component conjunctive cross‐coupling is highlighted by its first application of primary alkyl radicals, which were not compatible in previous reports. The readily prepared α‐silyl amines could be transferred to α‐amino radicals by photo‐induced single electron transfer step
1,2-Amino Alcohols via Cr/Photoredox Dual-Catalyzed Addition of α-Amino Carbanion Equivalents to Carbonyls
作者:J. Luca Schwarz、Roman Kleinmans、Tiffany O. Paulisch、Frank Glorius
DOI:10.1021/jacs.9b12053
日期:2020.2.5
Herein, we report the synthesis of protected 1,2-aminoalcohols starting from carbonyl compounds (mostly aldehydes) and α-silyl amines. The reaction is enabled by a Cr/photoredox dual catalytic system that allows the in situ generation of α-amino carbanion equivalents which act as nucleophiles. The unique nature of this reaction was demonstrated through the aminoalkylation of ketones and an acyl silane
Photoredox-enabled 1,2-dialkylation of α-substituted acrylates <i>via</i> Ireland–Claisen rearrangement
作者:Roman Kleinmans、Leon E. Will、J. Luca Schwarz、Frank Glorius
DOI:10.1039/d0sc06385a
日期:——
for the synthesis of valuable tertiary carboxylic acids by merging Giese-type radical addition with an Ireland–Claisenrearrangement. Key to success is the utilization of the reductive radical-polar crossover concept under photocatalytic reaction conditions to force the [3,3]-sigmatropic rearrangement after alkyl radical addition to allyl acrylates. Using readily available alkyl boronic acids as radical
The solution is divided into two phases, along with SO2 in the flue gas is absorbed. The two phases form a SO2 absorption solution once again, after the SO2 in the SO2-rich phase is released.