C–N Bond Activation of N,N′-Dialkylacylhydrazines Mediated by β-Fragmentation of Nitrogen-Centered Radical
摘要:
In the presence of tert-butylnitrite and dioxygen, the C-N bond activation of N,N'-dialkylacylhydrazines was realized, providing a series of N-nitrosoacylhydrazines in high yields. Different from transition-metal and other radical catalysis, this reaction is mediated by a nitrogen-centered radical of the corresponding N,N'-dialkylacylhydrazine and further beta-fragmentation, which was supported by the mechanistic study.
The borrowing hydrogen strategy has been applied in the synthesis of nonsymmetric N,N-dialkylated acyl hydrazides via a tandemthree-componentreaction catalyzed by a phosphine free diaminocyclopentadienone ruthenium tricarbonyl complex. This strategy represents the first direct one-pot approach to nonsymmetric functionalized acyl hydrazides. Different aromatic acyl hydrazides underwent dialkylation
Autotandem Catalyst: From Acylhydrazones to <i>N</i>′,<i>N</i>′-Methylaliphatic Acylhydrazides via Transfer Hydrogenation/<i>N</i>-Methylation with Methanol Catalyzed by a Cp* Iridium Complex Bearing a Functional Ligand
作者:Shiyuan Luo、Xiangchao Xu、Peng Zhang、Qixun Shi、Xiaoguang Yang、Feng Li
DOI:10.1021/acs.orglett.2c03719
日期:2022.12.16
A new strategy for the synthesis of N′,N′-methylaliphatic acylhydrazides from acylhydrazones via transfer hydrogenation/N-methylation with methanol as both the hydrogen source and the methylating reagent has been proposed and accomplished. In the presence of [Cp*Ir(2,2′-bpyO)(H2O)] (1 mol %) and Cs2CO3 (0.3 equiv), a range of desired products were obtained in high yields. It was also confirmed that