2-(penta-1,3-dienyl)oxazolidines: synthesis of hydroxylated piperidines by a stereoselective diels-alder Reaction
作者:Abid Hussain、Peter B Wyatt
DOI:10.1016/s0040-4020(01)86312-2
日期:1993.3
Hexa-2,4-dienal condensed with (-)-ephedrine to give predominantly the oxazolidine 4, which underwent a stereoselective Diels-Alder reaction with benzyl nitrosoformate to give the cycloadducts 9 and 10 in a ca 5:2 ratio. Further transformations of 9 to give the opticallyactive mono- and tri- hydroxypiperidine derivatives 11 and 15 have also been performed.