Intramolecular Hydroamination of Alkynes Catalyzed by Pd(PPh3)4/Triphenylphosphine under Neutral Conditions
摘要:
The intramolecular hydroamination of alkynes tethered with amino group 1 in the presence of catalytic amounts of Pd(PPh3)(4) and PPh3 in benzene at 100 degrees C proceeded smoothly without the use of any additional acid source to afford five and six-membered nitrogen heterocycles 2 in good to excellent yields. A compulsory addition of carboxylic acid as a cocatalyst was not needed, and the reaction could be carried out under essentially neutral conditions.
Intramolecular Hydroamination of Alkynes Catalyzed by Pd(PPh3)4/Triphenylphosphine under Neutral Conditions
摘要:
The intramolecular hydroamination of alkynes tethered with amino group 1 in the presence of catalytic amounts of Pd(PPh3)(4) and PPh3 in benzene at 100 degrees C proceeded smoothly without the use of any additional acid source to afford five and six-membered nitrogen heterocycles 2 in good to excellent yields. A compulsory addition of carboxylic acid as a cocatalyst was not needed, and the reaction could be carried out under essentially neutral conditions.
Synthesis of Eight‐Membered Nitrogen Heterocycles via a Heterogeneous PtI
<sub>2</sub>
‐Catalyzed Cascade Cycloaddition Reaction of δ‐Aminoalkynes with Electron‐Deficient Alkynes
作者:Xinhong Li、Songmeng Wang、Hongkai Wang、Weilin Wang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1002/adsc.201901644
日期:2020.4.8
cascade reaction of δ‐aminoalkynes was developed for the synthesis of various eight‐membered nitrogen heterocycles in excellent yields. The reaction proceeds via a hydration of δ‐aminoalkynes and subsequent intramolecular cyclization and intermolecular addition as well as ring‐expansion cascade reaction with another electron‐deficient alkynes. This method has the advantages of simple operation and mild