Abbreviated Synthesis of the C3−C14 (Substituted 1,7-Dioxaspiro[5.5]undec-3-ene) System of Okadaic Acid
作者:Amy B. Dounay、Craig J. Forsyth
DOI:10.1021/ol9906615
日期:1999.8.1
[formula: see text] Described is a novel, concise, and flexible synthesis of the C3-C14 portion of okadaic acid. A substituted valerolactone (C3-C8) was prepared in three steps and alpha-hydroxylated using Davis' oxaziridine. Conjugate addition of dimethylcuprate upon ynones derived from the C3-C8 lactones followed by intramolecular ketalization provided the C3-C14 fragment and revealed a significant