Catalyst-Free and Stereoselective Synthesis of N,N-Bicyclic Pyrazolidinone Derivatives
摘要:
A catalyst-free and stereoselective cycloaddition of pyrazolidin-3-one-derived azomethine imine to trans-beta-nitrostyrene is described, which allows versatile, efficient and highly enantioselective synthesis of N,N-bicyclic pyrazolidinone derivatives.
Thermal 1,3-dipolar cycloaddition of azomethine imines with alkynes affording N,N-bicyclic pyrazolidinones under microwave irradiation
作者:Zhi-Wei Yang、Jing-Fang Wang、Li-Jie Peng、Xiao-Lin You、Hai-Lei Cui
DOI:10.1016/j.tetlet.2016.10.030
日期:2016.11
A metal and catalyst free 1,3-dipolar cycloaddition reaction of azomethineimines with internal alkynes has been developed. Various N,N-bicyclic pyrazolidinones could be prepared quickly under microwave irradiation in moderate to excellent yields (up to 96%). A wide range of azomethineimines and electron-deficient internal alkynes were applicable to this reaction. In addition, gram-scale reaction
We developed a 1,3-dipolar cycloaddition reaction of azomethine imines with terminalalkynes catalyzed by group 11 metal amides to provide N,N-bicyclic pyrazolidinone derivatives. This reaction afforded the cycloadducts in a unique 5,7-disubstituted manner. Furthermore, we succeeded in applying this catalysis to asymmetricreactions, and the desired heterocycles were produced in high yields with exclusive
Highly Regioselective [3 + 2] Annulation of Azomethine Imines with 1-Alkynyl Fischer Carbene Complexes to Functionalized <i>N</i>,<i>N</i>-Bicyclic Pyrazolidin-3-ones
作者:Ning Luo、Zhaoyan Zheng、Zhengkun Yu
DOI:10.1021/ol201139w
日期:2011.7.1
The highly regioselective [3 + 2] cycloaddition of azomethine imines to 1-alkynyl Fischercarbenecomplexes has been successfully realized under mild conditions. Oxidative demetalation of the newly formed pyrazolo-pyrazolone carbenecomplexes with pyridine-N-oxide or ceric ammonium nitrate efficiently afforded pyrazolo-pyrazolone derivatives as well as cycloprop-2-enone and trisubstituted 1H-pyrazoles
A catalyst-free and stereoselective cycloaddition of pyrazolidin-3-one-derived azomethine imine to trans-beta-nitrostyrene is described, which allows versatile, efficient and highly enantioselective synthesis of N,N-bicyclic pyrazolidinone derivatives.