中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | methyl (4aR,6R,7R,8R,8aS)-8-[(4-methoxyphenyl)methoxy]-2,2,7-trimethyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxine-6-carboxylate | 929298-12-4 | C20H28O7 | 380.438 |
—— | [(4aR,6R,7S,8R,8aS)-8-[(4-methoxyphenyl)methoxy]-2,2,7-trimethyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl]methanol | 512781-95-2 | C19H28O6 | 352.428 |
Enantioselective approaches to the construction of four complex building blocks of the structurally intricate marine macrolide known as spongistatin 1 are presented. The first phase of the synthetic effort relies on a practical approach to a desymmetrized, enantiomerically pure spiroketal ring system incorporating rings A and B. Concurrently, the C17–C28 subunit, which houses one-fifth of the stereogenic centers of the target in the form of rings C and D, was assembled via a composite of stereocontrolled aldol condensations. Once arrival at the entire C1–C28 sector had been realized, routes were devised to provide two additional highly functionalized sectors consisting of C29–C44 and C38–C51. A series of subsequent transformations including cyclization of the E ring and hydroboration to afford the