Synthesis of Alkyl-Substituted Pyridines by Directed Pd(II)-Catalyzed C–H Activation of Alkanoic Amides
摘要:
A general alkylation protocol for substituted iodopyridines was developed (32 examples, 44-97% yield). The reaction is based on the Pd(II)-catalyzed C-H activation of 8-aminoquinoline-derived alkanoic amides and it employs a catalyst cocktail of Pd(OAc)(2) (10 mol%), NaI (30 mol%), and (BuO)(2)POOH (20 mol%), with Ag2CO3 as base.
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.
Synthesis of Alkyl-Substituted Pyridines by Directed Pd(II)-Catalyzed C–H Activation of Alkanoic Amides
作者:Thorsten Bach、Peng Hu
DOI:10.1055/s-0035-1560810
日期:——
A general alkylation protocol for substituted iodopyridines was developed (32 examples, 44-97% yield). The reaction is based on the Pd(II)-catalyzed C-H activation of 8-aminoquinoline-derived alkanoic amides and it employs a catalyst cocktail of Pd(OAc)(2) (10 mol%), NaI (30 mol%), and (BuO)(2)POOH (20 mol%), with Ag2CO3 as base.
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