A new catalytic method for the denitrogenative transannulation/cyclopropanation of in‐situ‐generated 2‐(diazomethyl)pyridines is described using a cobalt‐catalyzed radical‐activation mechanism. The method takes advantage of the inherent properties of a CoIII‐carbene radical intermediate and is the first report of denitrogenative transannulation/cyclopropanation by a radical‐activation mechanism, which
Cu-catalyzed transannulation reaction of pyridotriazoles with terminal alkynes under aerobic conditions: efficient synthesis of indolizines
作者:V. Helan、A. V. Gulevich、V. Gevorgyan
DOI:10.1039/c4sc03358b
日期:——
Cu(I)-catalyzed denitrogenative transannulation reaction of pyridotriazoles with terminalalkynes en route to indolizines was developed. Compared to the previously reported Rh-catalyzed transannulation reaction, this Cu-catalyzed method features aerobicconditions and a much broader scope of pyridotriazoles and alkynes.
开发了一种 Cu( I ) 催化的吡啶并三唑与末端炔烃脱氮转环反应生成中氮茚的过程。与之前报道的Rh催化转环反应相比,这种Cu催化方法具有需氧条件以及更广泛的吡啶并三唑和炔烃范围。
Organocopper reagents smoothly react with heterocyclic propargyl mesylates at low temperature to produce Mused heterocycles. The copper reagent plays a "double duty" in this novel cascade transformation, which proceeds via an S(N)2' substitution followed by a subsequent cycloisomerization step.
Chernyak; Gevorgyan, Chemistry of Heterocyclic Compounds, 2012, vol. 47, # 12, p. 1516 - 1526