Orthogonal Reactivity of Acyl Azides in C–H Activation: Dichotomy between C–C and C–N Amidations Based on Catalyst Systems
摘要:
The dual reactivity of acyl azides was utilized successfully in C-H activation by the choice of catalyst systems: while selective C-C amidation was achieved under thermal Rh catalysis, a Ru catalyst was found to mediate direct C-N amidation also highly selectively. Investigations of the mechanistic dichotomy between two catalytic systems are also presented.
The Rh(III)-catalyzed amidation of C(sp2)-H bonds has been reported by employing the N-methoxyamide as a novel amino source. An excellent level of functional group tolerance can be achieved when N-methoxyamide derivatives are used as the amidating reagents. Importantly, several known bioactive compounds such as Aminalon, Pregabalin, Gabapentin, and Probenecid can be transformed to effective amidating
Continuous-flow directed C–H amidation reactions using immobilized Cp*Rh(iii) catalysts
作者:Yuki Saito、Taro Konno、Shū Kobayashi
DOI:10.1039/d4gc01747a
日期:——
We report a green, continuous-flow C–Hamidation methodology using heterogeneous Cp*Rh(III) catalysts. These catalysts enable halide- and salt-free reactions with excellent activity and durability across diverse substrates, demonstrated by a 200-hour, multi-gram scale reaction exceeding 290 TON (turnover number).