Microwave-assisted treatment of various heterocyclic amides (benzodiazepinone, phthalazone) with TiCl4 in the presence of primary or secondary amines provides the corresponding amidines. In addition to the interest of the microwaves for this reaction, our study highlights the higher reactivity of the cyclic acetamide moiety compared to the cyclic benzamide moiety towards this TiCl4-mediated reaction.
Rh(III) Catalyzed Redox-Neutral C–H Activation/[5 + 2] Annulation of Aroyl Hydrazides and Sulfoxonium Ylides: Synthesis of Benzodiazepinones
作者:Pothapragada S. K. Prabhakar Ganesh、Perumal Muthuraja、Purushothaman Gopinath
DOI:10.1021/acs.orglett.3c03495
日期:2023.11.24
We herein report the Rh(III) catalyzed redox-neutral C–Hactivation/[5 + 2] annulation of aroyl hydrazides with sulfoxonium ylides as safe carbene precursors. The reaction shows excellent functional group tolerance, broad substrate scope, and scalability. We demonstrated the synthetic utility of the protocol via the synthesis of various diazepam drug analogues, late-stage functionalization of probenecid