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
<i>N</i>-Methoxyamide: An Alternative Amidation Reagent in the Rhodium(III)-Catalyzed C–H Activation
作者:Chao Zhou、Junqi Zhao、Weicong Guo、Jijun Jiang、Jun Wang
DOI:10.1021/acs.orglett.9b03357
日期:2019.12.6
In the field of transition-metal-catalyzed C-Hactivation, N-methoxyamides are widely used as C-Hactivation substrate. Unexpectedly, in this work N-methoxyamides were found to work as efficient amidation reagents in the rhodium(III)-catalyzedC-Hactivation with boric acid as a cocatalyst. This reaction features broad substrate scope and good yields.
A cationic cobalt(III)‐catalyzeddirectCH amidation of unactivated (hetero)arenes and alkenes by using 1,4,2‐dioxazol‐5‐ones as the amidating reagent has been developed. This transformation proceeds efficiently under external oxidant‐free conditions with a broad substrate scope. Moreover, 6‐arylpurine compounds, which often exhibit high potency in antimycobacterial, cytostatic, and anti‐HCV activities
Chemical Upcycling of Waste Poly(bisphenol A carbonate) to 1,4,2‐Dioxazol‐5‐ones and One‐Pot C−H Amidation
作者:Hyun Jin Jung、Sora Park、Hyun Sub Lee、Hyun Gyu Shin、Yeji Yoo、Ek Raj Baral、Jun Hee Lee、Jaesung Kwak、Jeung Gon Kim
DOI:10.1002/cssc.202100885
日期:2021.10.5
poly(bisphenol A carbonate) (PC) was achieved in this study with hydroxamic acid nucleophiles, giving rise to synthetically valuable 1,4,2-dioxazol-5-ones and bisphenol A. Using 1,5,7-triazabicyclo[4.4.0]-dec-5-ene (TBD), non-green carbodiimidazole or phosgene carbonylation agents used in conventional dioxazolone synthesis were successfully replaced with PC, and environmentally harmful bisphenol A was
本研究中使用异羟肟酸亲核试剂实现了聚(双酚 A 碳酸酯)(PC)的化学升级,产生了具有合成价值的 1,4,2-二恶唑-5-酮和双酚 A。使用 1,5,7-三氮杂双环传统二恶唑酮合成中使用的[4.4.0]-dec-5-烯(TBD)、非绿色碳二咪唑或光气羰基化剂成功地被PC替代,同时回收了对环境有害的双酚A。杂异羟肟酸表现出良好的效率和绿色化学特性,具有广阔的合成应用范围。此外,还开发了一种绿色芳基酰胺合成工艺,包括从聚碳酸酯到二恶唑酮的一锅解聚,然后是铑催化的 CH 酰胺化,包括使用光盘的克级实例。
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).