Access to Cyclobutene-Fused Azepines through Au-Catalyzed Cycloisomerization of Stable Alkyne Tethered Ketene <i>N,N</i>-Acetals
作者:Sanatan Nayak、Nayan Ghosh、Akhila K. Sahoo
DOI:10.1021/ol501125r
日期:2014.6.6
base promoted reaction between N-protected propargyl amines and 3-bromopropiolate readily provides an array of novel stable alkyne-tethered ketene N,N-acetals in good yields. A wide range of structurally complex cyclobutene-fused azepine heterocycles are synthesized through the gold-catalyzed intramolecular cycloisomerization of ketene N,N-acetals for the first time. A plausible reaction pathway is deduced
N-保护的炔丙基胺和3-溴丙酸酯之间的碱促进的反应容易以良好的产率提供了一系列新型的稳定的炔烃系链烯酮N,N-乙缩醛。首次通过金催化乙烯酮N,N-乙缩醛的分子内环异构化反应,合成了多种结构复杂的环丁烯稠合的ze庚因杂环。根据1 H NMR研究推论出可能的反应途径。
Alkyne Versus Ynamide Reactivity: Regioselective Radical Cyclization of Yne‐Ynamides
作者:Shubham Dutta、Rajendra K. Mallick、Rangu Prasad、Vincent Gandon、Akhila K. Sahoo
DOI:10.1002/anie.201811947
日期:2019.2.18
Ynamides are typically more reactive than simple alkynes and olefins. However, a serendipitous observation revealed a rare case where the reactivity of simple alkynes exceeds that of ynamides. This led to the development of a unique sulfur‐radical‐triggered cyclization of yne‐tethered ynamides, which involves attack of the alkyne by a thiyl radical followed by cyclization with the ynamide. A wide range