Room‐Temperature Palladium‐Catalyzed Deuterogenolysis of Carbon Oxygen Bonds towards Deuterated Pharmaceuticals
作者:Wei Ou、Xudong Xiang、Ru Zou、Qing Xu、Kian Ping Loh、Chenliang Su
DOI:10.1002/anie.202014196
日期:2021.3.15
Site‐specific incorporation of deuterium into drug molecules to study and improve their biologicalproperties is crucial for drug discovery and development. Herein, we describe a palladium‐catalyzed room‐temperature deuterogenolysis of carbon–oxygen bonds in alcohols and ketones with D2 balloon for practical synthesis of deuterated pharmaceuticals and chemicals with benzyl‐site (sp3 C−H) D‐incorporation. The
Interweaving Visible‐Light and Iron Catalysis for Nitrene Formation and Transformation with Dioxazolones
作者:Jing‐Jing Tang、Xiaoqiang Yu、Yi Wang、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202016234
日期:2021.7.19
transfer reactions with dioxazolones for intermolecular C(sp3)-N, N=S, and N=P bond formation are described. These reactions occur with exogenous-ligand-free process and feature satisfactory to excellent yields (up to 99 %), an ample substrate scope (109 examples) under mild reaction conditions. In contrast to intramolecular C−H amidations strategies, an intermolecular regioselective C−H amidation via
An Efficient Ga(OTf)<sub>3</sub>/Isopropanol Catalytic System for Direct Reduction of Benzylic Alcohols
作者:Masahiro Sai
DOI:10.1002/adsc.201801135
日期:2018.11.16
first gallium‐catalyzed direct reduction of benzylicalcohols using isopropanol as a reductant. The reaction proceeds via gallium catalyst‐assisted hydride transfer of the in situ‐generated benzylic isopropyl ether. The method generates only water and acetone as byproducts and thus provides an atom‐economic and environmentally friendly approach to the synthesis of di‐ and triarylmethanes, which are important
DDQ-Catalyzed Oxidative CO Coupling Of sp<sup>3</sup>CH Bonds With Carboxylic Acids
作者:Hong Yi、Qiang Liu、Jie Liu、Ziqi Zeng、Yuhong Yang、Aiwen Lei
DOI:10.1002/cssc.201200458
日期:2012.11
catalytic amounts of DDQ combined with MnO2 as oxidant, an efficient oxidative CO coupling of benzylic sp3 CH bonds with carboxylic acids affords a series of carboxylic esters in 70–98 % yields. A wide range of functional groups and various carboxylic acids are tolerated. The reaction involves both CH functionalization and CO bond formation.
Substitution of secondary allylic phosphates with the anions derived from Ar2CH2 with BuLi or LDA proceeded regioselectively and stereoselectively without a metal catalyst, affording inversion products in good yield. Similarly,...