作者:Dariusz Socha、Margarita Jurczak、Marek Chmielewski
DOI:10.1016/s0008-6215(01)00265-8
日期:2001.12
o-pyrrolidino[1,2-b]isoxazolidino[4,5-c]tetrahydropyran (8) prepared by (1,3)-dipolar cycloaddition of the cyclic nitrone 6 derived from tartaric acid to 5,6-dihydro-2H-pyran-2-one (7) was transformed into indolizidine 11 via a sequence of reactions involving methanolysis of the lactone ring, intramolecular alkylation of the nitrogen atom promoted by a carbontetrabromide-triphenylphosphine mixture
(1aR,5aR,5bS,6S,7S)-6,7-二叔丁氧基-5-氧代-吡咯烷酮[1,2-b]异恶唑烷酮[4,5-c]四氢吡喃(8)经由酒石酸内酯环的甲醇分解的一系列反应,将由酒石酸衍生的环状硝酮6,3)-偶极环加成到5,6-二氢-2H-吡喃-2-酮(7)上,转化成吲哚并咪唑11。四溴化碳-三苯基膦混合物和N单键O键的氢解促进了氮原子的烷基化。11的脱羧提供了已知的7-羟基龙胆苷衍生物14,而氧化脱羧则得到了与粟精胺结构相关的吲哚并立定15。