6R,8S,10S,1'R,1' 'R)-2(acetylhydroxymethyl)-4,10-dimethyl-8(isopropenylhydroxymethyl)-1,7-dioxaspiro[5,5]undecane (4a) and its C1' '-epimer (4b), the key mother spiroketals of the HIV-1 protease inhibitive didemnaketals from the ascidian Didemnum sp., has been carried out through multisteps from the natural (R)-(+)-pulegone, which involved the diastereoselective construction of four chiral carbon centers(C-2
(2S,4R,6R,8S,10S,1'R,1''R)-2(乙酰羟甲基)-4,10-二甲基-8(异
丙烯基羟甲基)-1,7-二氧杂螺环的立体控制合成[5,5 ]
十一烷(4a)及其C1'-顶基(4b)是来自海鞘Didemnum sp。的HIV-1
蛋白酶抑制性
二苯甲酮的关键母亲螺环,已通过天然(R)-(+ )-pulegone,涉及通过分子内手性诱导诱导四个手性碳中心(C-2,C-6,C-8和C-1')的非对映选择性。