The reactions of p-toluenesulfonylmethyl isocyanide (TosMIC) with α-bromocarbonyl compounds leading efficiently to α-sulfonated ketones, esters, and amides were reported, in which an explicit new role of TosMIC as the sulfonylating agent was uncovered for the first time. Mechanistic study by control experiments and DFT calculations suggested that the reaction is initiated by Cu(OTf)2-catalyzed hydration
的反应p -toluenesulfonylmethyl胩(TOSMIC)用α-溴代化合物有效地导致α-磺化酮,酯和酰胺的报道,其中TOSMIC作为磺酰化剂的显式的新角色被揭露首次。通过对照实验和DFT计算进行的机理研究表明,该反应是由Cu(OTf)2催化的TosMIC水合引发的,形成了甲酰胺中间体,该中间体在Cs 2 CO 3添加剂的介导下易于进行C-S键裂解。
Vinot,N., Bulletin de la Societe Chimique de France, 1973, p. 2752 - 2755
作者:Vinot,N.
DOI:——
日期:——
α-Oxo-Ketenimines from Isocyanides and α-Haloketones: Synthesis and Divergent Reactivity
作者:Mathias Mamboury、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201703458
日期:2017.9.18
β-Hydride elimination at will: Reaction of α-haloketones with isocyanides in the presence of a catalytic amount of Pd(OAc)2 afforded α-oxo-ketenimines that can be further converted to 5-aminopyrazoles, tetrazole, β-keto amidines and enaminone in good to excellent yields.