Regio- and Stereoselective Hydrophosphorylation of Ynamides for the Synthesis of β-Aminovinylphosphine Oxides
作者:Hai Huang、Hongjun Zhu、Jun Yong Kang
DOI:10.1021/acs.orglett.8b01065
日期:2018.5.4
A metal-free hydrophosphorylation of ynamides with diaryl phosphine oxides has been developed. A highly E-selective and β-regioselective hydrophosphorylation protocol has been established as a general method for the synthesis of diversely hydrophosphinylated products employing an in situ generated electrophilic phosphorus species. Deuterium incorporation experiments suggest that the amino phosphirenium
Intermolecular and Selective Synthesis of 2,4,5-Trisubstituted Oxazoles by a Gold-Catalyzed Formal [3+2] Cycloaddition
作者:Paul W. Davies、Alex Cremonesi、Lidia Dumitrescu
DOI:10.1002/anie.201103563
日期:2011.9.12
Oxazole new world: A gold‐catalyzed intermolecular reaction of pyridine‐N‐aminides with ynamides can be used to prepare trisubstituted 1,3‐oxazoles with a variety of functional groups. This formal [3+2] cycloaddition employs robust conjugated N‐ylides as N‐nucleophilic N‐acyl nitrene equivalents for a highly chemoselective and regioselective addition across electron‐rich CC triple bonds.
Synthesis of Amide Enol Carbamates and Carbonates through Cu(OTf)<sub>2</sub>-Catalyzed Reactions of Ynamides with <i>t</i>-Butyl Carbamates/Carbonates
作者:Pan Han、Zhuo-Ya Mao、Ming Li、Chang-Mei Si、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/acs.joc.9b03512
日期:2020.4.3
A highly regioselective approach to access amide enol carbamates and carbonates 5a–5c′, 7a–7h, and 9 was developed through Cu(OTf)2-catalyzed reactions of ynamides 4 with t-butyl carbamates 2 and 8 and t-butyl carbonates 6. Moreover, this strategy was successfully applied to generate amide enol carbamates 11a–11s and 14a–14f from imides 10 and 13 with ynamides through an N-Boc cleavage–addition ring-opening
Synthesis of 2-Aza-1,3-butadienes through Gold-Catalyzed Intermolecular Ynamide Amination/C–H Functionalization
作者:Chao Shu、Cang-Hai Shen、Yong-Heng Wang、Long Li、Tao Li、Xin Lu、Long-Wu Ye
DOI:10.1021/acs.orglett.6b02267
日期:2016.9.16
A novel gold-catalyzed tandem intermolecular ynamide amination/C–H functionalization has been developed. A variety of highly functionalized 2-aza-1,3-butadienes can be obtained readily by utilizing this strategy. In addition, α-imino gold carbene intermediates are proposed in this amination reaction and with support by DFT (density functional theory) calculations.