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 optically active mono- and tri- hydroxypiperidine derivatives 11 and 15 have also been performed.
与(-)-麻黄碱缩合的2,4-己二烯六酸酯主要生成恶唑烷4,恶唑烷4与亚硝基甲酸苄酯进行立体选择性Diels-Alder反应,以约5:2的比例生成环加合物9和10。还已经进行了9的进一步转化以给出光学活性的单和三羟基哌啶衍生物11和15。