The Deoxygenation and Isomerization of Artemisinin and Artemether and Their Relevance to Antimalarial Action
作者:Charles W. Jefford、Maria G. H. Vicente、Yvan Jacquier、France Favarger、Jiri Mareda、Patricia Millasson-Schmidt、Gerhard Brunner、Ulrich Burger
DOI:10.1002/hlca.19960790520
日期:1996.8.7
The treatment of artemisinin (1) and β-artemether (6) with Zn dissolving in AcOH for a few hours results in mono-deoxygenation giving deoxyartemisinin (5) and deoxy-β-artemether (7), respectively, as the sole product. In contrast, submission of 1 to FeCl2 · 4 H2O in MeCN at room temperature for 15 min causes only isomerization, (3aS,4R,6aS,7R,10S,10aR)-octahydro-4,7-dimethyl-8-oxo-2H-10H-furo[3,2-i]
用锌溶解在AcOH中的青蒿素(1)和β-蒿甲醚(6)处理数小时会导致单脱氧,分别得到脱氧青蒿素(5)和脱氧-β-蒿甲醚(7)作为唯一产品。相比之下,室温下在MeCN中向FeCl 2 ·4 H 2 O中1提交15分钟只会引起异构化(3a S,4 R,6a S,7 R,10 S,10a R)-八氢-4, 7-二甲基-8-氧代-2 H -10 H-呋喃[3,2- i ]苯并吡喃-10-乙酸基酯((8)和(3 R)-3-羟基脱氧青蒿素(9)的产率分别为78%和17%。FeCN 2 ·4 H 2 O在MeCN中对6的作用相似。在相同条件下,6产生类似于8和9的产物,并带有2- [4-甲基-2-氧代-3-(3-氧代丁基)环己基]丙醛的差向异构体混合物,产率分别为32%,23%和16% , 分别。在环己烯的存在下重复最后两个实验不会形成环氧化物。就其亲氧性质而言,锌对1和6的脱氧是合理的。1的催化异构化Fe