Stereoselective Synthesis of Diazabicyclic β-Lactams through Intramolecular Amination of Unactivated C(sp<sup>3</sup>)–H Bonds of Carboxamides by Palladium Catalysis
An efficient C(sp3)–H bond activation and intramolecular amination reaction via palladiumcatalysis at the β-position of carboxyamides to make β-lactams was described. The investigation of the substrate scope showed that the current reaction conditions favored activation of the β-methylene group. Short sequences were developed for preparation of various diazabicyclic β-lactam compounds with this method
Palladium-Catalyzed β-C–H Arylation of Alkyl Carboxamides with Sterically Hindered Aryl Iodides Using <i>ortho</i>-Sulfinyl Aniline Auxiliaries
作者:Delong Mu、Fang Gao、Gong Chen、Gang He
DOI:10.1021/acscatal.6b03661
日期:2017.3.3
ortho-sulfinylaniline auxiliaries for palladium-catalyzed β–C-H arylation of alkyl carboxamides. Together, these auxiliaries offer a means to effect efficient β-methyl and methylene C–H bond arylation with sterically hindered aryl iodides. ortho-Methylsulfinylaniline (MSOA) enables efficient β-methyl C–H arylation of propanamide substrates with aryl iodides bearing various ortho-substituents including alkyl
organic synthesis. Catalytic reactions featuring intramolecular C–H amidation of alkyl carboxamide substrates could provide a straightforward disconnection strategy for β-lactam synthesis. Herein, we report a streamlined method for asymmetricsynthesis of β-aryl β-lactams from propanoic acid and aryl iodides via Pd-catalyzed sequential C(sp3)–H functionalization. The lactam-forming reaction provides