An efficient method to synthesize the beta-lactams with high regioselectivity via Pd-catalyzed C(sp(3))-H bond activation and intramolecular arnination of simple and readily available aminoquinoline carboxamides was demonstrated. C6F5I plays a significant role in the formation of the C-N bond of the four-membered ring beta-lactams. High yield along with wide substrate scope and functional group tolerance makes this reaction applicable to build natural-product-derived beta-lactams. This method has been applied to the efficient synthesis of the beta-lactamase inhibitor MK-8712.
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