Oncinotine-Type Spermidine Alkaloids fromOncinotis tenuiloba. Transformation ofN-acetyloncinotin-12-one toN,N?-diacetylinandenin-12-one
作者:Martin K.-H. Doll、Armin Guggisberg、Manfred Hesse
DOI:10.1002/hlca.19960790405
日期:1996.6.26
of Oncinotis tenuiloba STAPF, two novel polyamine alkaloids, oncinotin-11-one (5) and oncinotin-12-one (6), were isolated. Peracetylation of 6 provided the N-acetyl derivative 11 as well as N,N′-diacetylinandenin-10-en-12-one (12) due to a β-elimination-type side reaction resulting in ring enlargement of 11 (Scheme 1). Deuteration of 12 yielded 13, showing the same retention time as N,N′-diacetylinandenin-12-one
从Oncinotis tenuiloba STAPF的提取物中,分离出两种新颖的多胺生物碱,oncinotin-11-one(5)和oncinotin-12-one(6)。由于β-消除型副反应导致11的环扩大,所以6的过乙酰化提供了N-乙酰基衍生物11以及N,N'-二乙酰基茚满宁-10-en-12-one(12)(方案1) 。的氘化12,得到13,示出了相同的保留时间Ñ,ñ '-diacetylinandenin -12-酮(14),当与不同的酮异构体N,N'-二乙酰基茚满酮一起进行共HPLC时。结构鉴定通过延长施密特的降解6和Ñ,Ñ '二乙酰基(-10,11- 2 ħ 2)inandenin -12-酮(13); 通过GC和ESI-MS鉴定降解产物。5的结构是在光谱学手段的基础上提出的。5的光谱数据与合成材料的光谱数据以及N-乙酰基衍生物20的co-HPLC的比较与相应的合成化合物一起揭