Visible Light-Induced Selective Generation of Radicals from Organoborates by Photoredox Catalysis
作者:Yusuke Yasu、Takashi Koike、Munetaka Akita
DOI:10.1002/adsc.201200588
日期:2012.12.14
A new strategy for the generation of carbon-centered radicals via oxidation of alkyl-, allyl-, benzyl- and arylborates by visible-light-driven single electron transfer (SET) photoredoxcatalysis has been established. The generated radicals smoothly react with TEMPO and electron-deficient alkenes to afford CO and CC coupling products, respectively. In this radical initiating system, cyclic organo(triol)borates
An efficient protocol for the synthesis of alpha-benzyl azetidines starting from benzylboronic acid pinacol ester derivatives and 3-iodoazetidine was developed. A wide range of alpha-benzyl azetidine derivatives were obtained in moderate to good yields with high regioselectivity (>99%). (C) 2019 Elsevier Ltd. All rights reserved.
SYNTHESIS OF BENZYLBORONATES VIA PALLADIUM-CATALYZED BORYLATION OF BENZYL HALIDES WITH PINACOLBORANE
Various benzyl halides were borylated with pinacolborane in the presence of (Pr2NEt)-Pr-i and a catalytic amount of PdCl2(PPh3)(2) to afford the corresponding benzylboronates in good yields.