中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (2R,3S)-4-[(2S,4S,6R,8R,10S)-8-Benzyloxymethyl-10-(tert-butyl-diphenyl-silanyloxy)-4-methoxy-1,7-dioxa-spiro[5.5]undec-2-yl]-3-(tert-butyl-dimethyl-silanyloxy)-2-methyl-butyraldehyde | 262614-92-6 | C45H66O7Si2 | 775.186 |
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