A new, highly stereoselective approach to pyrrolidines via overall 5-endo-trig cyclisations of homoallylic tosylamides
作者:Andrew D. Jones、David W. Knight
DOI:10.1039/cc9960000915
日期:——
Iodocyclisations of E-homoallylic tosylamides 7 lead to excellent yields of either 2,5-trans-or 2,5-cis-3-iodopyrrolidines (10 or 11), depending upon the reaction conditions.
Pyridinium Dichromate in Organic Chemistry: A New Synthesis of Enedicarbonyl Compounds
作者:Maurizio D'Auria、Antonella De Mico、Franco D'Onofrid、Arrigo Scettri
DOI:10.1055/s-1985-31419
日期:——
Enedicarbonyl compounds (2-alkene-1,4-diones) are prepared by oxidation of 1-substituted 3-alkenols (homoallylic alcohols) with pyridinium dichromate in dimethylformamide. The reaction proceeds via 3-alkenyl ketones as intermediates which can in some cases be isolated after short reaction times.