groups and decarboxylation in the last stage. The efficiency of this strategy was demonstrated by the stereoselective synthesis of pyrrolizidinone rac-4, a highly efficient analogue of antidepressant Rolipram, from nitroethane. 5,6-dihydro-4H-1,2-oxazines - reduction - pyrrolidones - pyrrolizidinones - Rolipram
容易获得[(5,6-二氢-4- ħ -1,2-恶嗪-3-基)甲基]
丙二酸酯1转化成取代的5-(3-羟丙基)
吡咯烷-2-酮2和pyrrolizidinones 3,这是用于有机和
生物有机
化学的多功能产品和中间体。所建议的合成序列包括对
肟基片段的立体选择性两步还原,然后进行涉及CO 2 Me基团之一的分子内环化和最后阶段的脱羧。该策略的有效性通过
吡咯嗪酮rac - 4(一种高效的抗抑郁药物来利普兰的类似物)从
硝基乙烷的立体选择性合成得到证明。 5,6-二氢-4 H -1,2-恶嗪-还原-
吡咯烷酮-
吡咯烷酮-
咯利普兰