A convenient stereoselective preparation of meso-2,6-disubstituted-4-piperidones has been developed by imino-Diels–Alder reaction of 2-amino-1,3-butadienes with imines in the presence of catalytic amount of Cu(TfO)2.
[reaction: see text] The first successful catalytic oxidation procedure for the chemoselective conversion of imines to nitrones is reported. The reaction is general, high yielding, and user and environmentally friendly, and furnishes a solution to the yet unanswered issue of regioselective access to nitrones by oxidation of nitrogen derivatives.
Substituent effects on the cyclo-manganation reaction X-ray crystal structure of Mn{2-(nBu-N=CH) 5-(NO2) C6H3}(CO)4
作者:Colin Morton、David J. Duncalf、Jonathan P. Rourke
DOI:10.1016/s0022-328x(96)06663-6
日期:1997.3
The cyclometallation reaction between methylmanganese pentacarbonyl and a number of Schiff's bases has been studied. The dependence of the rate of reaction upon ligand substituents has been investigated, demonstrating a rate enhancement with more electron-rich ligands.