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