Nitroxide‐Catalyzed Oxidative Amidation of Aldehydes to Yield
<i>N</i>
‐Acyl Azoles Using Sodium Persulfate
作者:Fabrizio Politano、Arturo León Sandoval、Mason L. Witko、Katrina E. Doherty、Chelsea M. Schroeder、Nicholas E. Leadbeater
DOI:10.1002/ejoc.202101239
日期:2022.1.27
In the presence of a catalytic quantity of a nitroxide salt, sodium persulfate can be used for the oxidative amidation of aldehydes to yield acyl azoles.
interactions of phosphonium salts. Amino acid derived phosphonium salts and dipeptide derived phosphonium salts exhibited different properties for controlling the transition state, which could efficiently promote the Michael addition reaction to give opposite configurations of products with high yields and enantioselectivities. Preliminary investigations on the mechanism of the reaction and applications of
Chiral Calcium Bis-sulfonimide Catalyzed Diels-Alder Reactions of 1-Acryloyl-pyrazole
作者:Ryukichi Takagi、Yuhei Yamasaki
DOI:10.1246/cl.210403
日期:2021.10.5
Alkaline earth metal salts of chiral bis-sulfonimide were prepared in this study. Asymmetric Diels-Alderreactionscatalyzed by these metal salts were examined to evaluate the performance of bis-sulfonimide as a chiral ligand. The Diels-Alderreaction between 2-propenoyl pyrazole and cyclopentadiene catalyzed by the calcium salt afforded the cycloaddition product with moderate stereoselectivity.
Highly enantioselective Michael addition of malononitrile to α,β-unsaturated pyrazolamides catalyzed by a bifunctional thiourea
作者:Yuanqin Zheng、Yongqi Yao、Ling Ye、Zhichuan Shi、Xuefeng Li、Zhigang Zhao、Xinying Li
DOI:10.1016/j.tet.2015.12.067
日期:2016.2
A new protocol for the organocatalytic asymmetric Michaeladdition of malononitrile to α,β-unsaturated pyrazolamides is reported. The Michael reaction proceeded smoothly in the presence of a bifunctional thiourea and provided the desired adducts in moderate to excellent yields (27–99%) and good to excellent enantioselectivities (80–95% ee).