Visible-Light Photoredox-Catalyzed Giese Reaction: Decarboxylative Addition of Amino Acid Derived α-Amino Radicals to Electron-Deficient Olefins
作者:Anthony Millet、Quentin Lefebvre、Magnus Rueping
DOI:10.1002/chem.201602257
日期:2016.9.12
A tin‐ and halide‐free, visible‐light photoredox‐catalyzed Giese reaction was developed. Primary and secondary α‐amino radicals were generated readily from aminoacids in the presence of catalytic amounts of an iridium photocatalyst. The reactivity of the α‐amino radicals has been evaluated for the functionalization of a variety of activated olefins.
Direct Decarboxylative Allylation and Arylation of Aliphatic Carboxylic Acids Using Flavin‐Mediated Photoredox Catalysis
作者:Nieves P. Ramirez、Teresa Lana‐Villarreal、Jose C. Gonzalez‐Gomez
DOI:10.1002/ejoc.201900888
日期:2020.3.15
This work was generously supported by the Spanish Ministerio de Economia y Competitividad (CTQ2017–88171-P) and the Generalitat Valenciana (AICO/2017/007). N. P. R. thanks to Instituto de Sintesis Organica for financial support.
这项工作得到了西班牙经济与竞争部长 (CTQ2017-88171-P) 和巴伦西亚政府 (AICO/2017/007) 的慷慨支持。NPR 感谢 Instituto de Sintesis Organica 的财政支持。
Chemospecific Cyclizations of α‐Carbonyl Sulfoxonium Ylides on Aryls and Heteroaryls
作者:Daniel Clare、Benjamin C. Dobson、Phillip A. Inglesby、Christophe Aïssa
DOI:10.1002/anie.201910821
日期:2019.11.4
The functionalization of aryl and heteroaryls using α‐carbonylsulfoxoniumylides without the help of a directing group has remained so far a neglected area, despite the advantageous safety profile of sulfoxoniumylides. Described herein are the cyclizations of α‐carbonylsulfoxoniumylides onto benzenes, benzofurans and N‐p‐toluenesulfonyl indoles in the presence of a base in HFIP, whereas pyrroles
We report an effective dynamic kineticresolution (DKR) system of racemic2-(1H-pyrrol-1-yl)alkanoic acids, which consists of a rapid racemization step via an activating substrate and an enantio-di...
METHOD FOR PRODUCING OPTICALLY ACTIVE CARBOXYLIC ACID ESTER
申请人:TOKYO UNIVERSITY OF SCIENCE FOUNDATION
公开号:US20170008820A1
公开(公告)日:2017-01-12
Provided is a method for producing an optically active carboxylic acid ester at a high yield and with high enantioselectivity using dynamic kinetic resolution, said optically active carboxylic acid ester having an α-nitrogen substituent. This method for producing an optically active carboxylic acid ester includes a step in which racemic carboxylic acid represented by formula (a) and a specific alcohol or phenol derivative are reacted in a polar solvent having a dipole moment of at least 3.5 in the presence of an acid anhydride and an asymmetric catalyst, one enantiomer of the racemic carboxylic acid is selectively esterified, and the other enantiomer is racemized. In formula (a), Ra1 represents a nitrogen-containing heteroaromatic ring group bonded to an assymetric carbon via a nitrogen atom constituting a ring, and Ra2 is an organic group.