Synthesis of α-hydroxy acid derivatives by the photochemical reaction of O-silylchromium(0) carbene complexes and nucleophiles
作者:Benito Alcaide、Luis Casarrubios、Gema Domínguez、Miguel A. Sierra
DOI:10.1016/0020-1693(94)03917-8
日期:1994.7
process. The reaction involves sequential treatment of the ammoniumsalts with TMSCl to form pentacarbonyl(silyloxycarbene)chromium(0) complexes, and further irradiation of these complexes in the presence of p -anisidine. Additionally, evidence of competitive nucleophile substitution at the carbene carbon by amines and Si-O bond cleavage in silyloxychromium carbene complexes is shown.
Synthesis of α-Hydroxyl Amides via Direct Amidation of Lactic Acid at Solvent- and Catalyst-Free Conditions
作者:Meiying Huang、Shanshan Zhong、Mengli Xu、Yunyun Liu
DOI:10.3184/174751915x14295180195555
日期:2015.5
The efficient synthesis of α-hydroxy-amides has been achieved by the direct amidation of lacticacid using primary amines. The reactions proceed smoothly under solvent-free conditions without using any catalyst. In general, good to excellent yields of products are obtained.
Existing protocols for the boryl radical promoted dehydroxylative alkylation of α-hydroxy carboxylic acidderivatives via C−O bond cleavage require the use of expensive radical initiators and relatively harsh conditions. An improved protocol is presented that uses cheap and readily available sodium tetraphenyl borate (NaBPh4) as a boron radical source. The reaction using the photoredox catalytic system
Photochemical Deoxygenative Hydroalkylation of Unactivated Alkenes Promoted by a Nucleophilic Organocatalyst
作者:Jadab Majhi、Bianca Matsuo、Hyunjung Oh、Saegun Kim、Mohammed Sharique、Gary A. Molander
DOI:10.1002/anie.202317190
日期:2024.2.5
A new photochemical method for deoxygenative hydroalkylation of a wide range of alkenes and lactic acid derivatives is reported. This approach utilizes thiophenol as a nucleophilic organic catalyst which forms the key intermediate of this transformation via an SN2 process.
报道了一种用于多种烯烃和乳酸衍生物脱氧加氢烷基化的新光化学方法。该方法利用苯硫酚作为亲核有机催化剂,通过 S N 2 过程形成该转化的关键中间体。