Copper(II)-Catalyzed Room Temperature Aerobic Oxidation of Hydroxamic Acids and Hydrazides to Acyl-Nitroso and Azo Intermediates, and Their Diels–Alder Trapping
作者:Duangduan Chaiyaveij、Leah Cleary、Andrei S. Batsanov、Todd B. Marder、Kenneth J. Shea、Andrew Whiting
DOI:10.1021/ol201188d
日期:2011.7.1
2-ethyl-2-oxazoline ligand, is an effective catalyst for the room temperature, aerobicoxidation of hydroxamic acids and hydrazides, to acyl-nitroso and azo dienophiles respectively, which are efficiently trapped in situ via both inter- and intramolecular hetero-Diels–Alder reactions with dienes. Both inter- and intramolecular variants of the Diels–Alder reaction are suitable under the reaction conditions using a variety
Type 2 Intramolecular <i>N</i>-Acylazo Diels−Alder Reaction: Regio- and Stereoselective Synthesis of Bridgehead Bicyclic 1,2-Diazines
作者:Claudia L. Molina、Chun P. Chow、Kenneth J. Shea
DOI:10.1021/jo070978f
日期:2007.8.31
The type 2 intramolecular N-acylazo Diels−Alder reaction provides a regio- and stereoselective synthesis of bicyclic 1,2-diazine systems. A new method for the generation of N-acylazo dienophiles with tetra-n-butylammonium periodate is reported. X-ray crystallographic analysis allowed the quantification of structural distortions of the nonplanar bridgehead olefin and lactam functionalities in 1,2-diazine