中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (3aS,8S,13aS,E)-2,2,8-trimethyl-9,10,11,12,13,13a-hexahydro-3aH-[1,3]dioxolo[4,5-e][1]oxacyclododecin-6(8H)-one | 912365-65-2 | C15H24O4 | 268.353 |
—— | ethyl (Z)-3-[(4S,5S)-5-[(6S)-6-hydroxyheptyl]-2,2-dimethyl-1,3-dioxolan-4-yl]prop-2-enoate | 1357160-66-7 | C17H30O5 | 314.422 |
—— | (Z)-3-((4S,5S)-5-((S)-6-hydroxyheptyl)-2,2-dimethyl-1,3-dioxolan-4-yl)acrylic acid | 912365-45-8 | C15H26O5 | 286.368 |
The (−)-enantiomer, ent-3, of the natural product (+)-cladospolide C (3) has been prepared for the first time using the monochiral cis-1,2-dihydrocatechol 5 as starting material. Key steps include coupling of the derived acid 6 with the enzymatically generated (S)-(+)-4-penten-2-ol (7) and ring-closing metathesis (RCM) of the resultant doubly unsaturated ester 8 to give lactone 9. The structure of this last compound has been confirmed by single-crystal X-ray analysis. This work has established that the absolute configuration of (+)-cladospolide C has been correctly assigned and is as illustrated in structure 3.