作者:Lizhen Jiang、Xiaojing Liu、Po Yuan、Yanli Zhang、Xiaochuan Chen
DOI:10.1021/acs.jnatprod.6b00522
日期:2017.4.28
A stereoselective synthetic approach was utilized to synthesize enantiopure annuionones A (1b) and B (2b), two ionone-type norsesquiterpenoids that both bear a 6-oxabicyclo[3.2.1]octane framework and possess allelopathic activity. A stereoselective Diels–Alder reaction based on chiral trisubstituted dienophile 20 was employed to obtain the optically active polysubstituted cyclohexane core of both natural
立体选择性合成方法被用来合成对映体纯的紫罗兰酮A(1b)和B(2b),这两种紫罗兰酮型去甲倍半萜类化合物均带有6-氧杂环[3.2.1]辛烷骨架,并具有化感活性。基于手性三取代的亲二烯体20的立体选择性Diels-Alder反应用于获得两种天然产物的旋光多取代环己烷核。使用这种方法,从乳醇(+)- 15合成10%的总产率的(+)-紫罗兰酮A(1b)和(-)-紫罗兰酮B(2b)。