A TMSOTf-catalyzed hydroalkoxylation of ynesulfonamides with esters is described for the efficient synthesis of alkoxy-substituted enamides with high stereoselectivity.
A metal-free [2 + 2 + 2] cycloaddition of alkyne-cyanamides or ynamide-nitriles with ynamides is described for the efficient synthesis of amino-substituted α- and δ-carbolines. This novel methodology is environmentally friendly and allows for highly regioselective access to carboline derivatives in good to excellent yields with wide functional group tolerance.
Synthesis of α,β-Unsaturated Amidines through Gold-Catalyzed Intermolecular Reaction of Azides with Ynamides
作者:Peng-Peng Ruan、Hang-Hao Li、Xin Liu、Te Zhang、Shao-Xuan Zuo、Chunyin Zhu、Long-Wu Ye
DOI:10.1021/acs.joc.7b01689
日期:2017.9.1
and flexible synthesis of α,β-unsaturated amidines via gold-catalyzed intermolecular ynamide amination/carbene 1,2-shift between ynamides and benzylic azides has been developed. Under mild reaction conditions, various α,β-unsaturated amidines were obtained in mostly good yields, thus providing an efficient and atom-economic way for the construction of valuable α,β-unsaturated amidines.
Metal-Free Formal Inverse-Electron-Demand Diels–Alder Reaction of 1,2-Diazines with Ynamides
作者:Jian Xue、Erhui Gao、Xiao-Na Wang、Junbiao Chang
DOI:10.1021/acs.orglett.8b02431
日期:2018.10.5
A highly effective metal-free formal inverse-electron-demand Diels–Alder reaction of 1,2-diazines with ynamides has been developed. This catalytic protocol is more environmentally friendly and allows for the construction of 2-aminonaphthalenes and 2-aminoanthracenes from 1,2-diazines and ynamides in good to high yields with wide diversity and functional group tolerance.
to highly substituted 1-naphthol and 2-naphthol derivatives via Lewis acids catalyzed annulations of ynamides with acylchlorides are described here. A one-pot synthesis of 4-amino-2-naphthol derivatives is accomplished via a ZnI2-catalyzed tandem Friedel–Crafts reaction sequence. While in the presence of Pd(0) catalyst, a [2 + 2] cycloaddition reaction of ynamides with monosubstituted ketenes that