中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1,4-benzoquinone bis(ethylene ketal) | 35357-33-6 | C10H12O4 | 196.203 |
8,8-二甲氧基-1,4-二氧杂螺[4.5]癸-6,9-二烯 | Ethylene dimethyl bisketal of benzoquinone | 75714-43-1 | C10H14O4 | 198.219 |
—— | 2-(8-methoxy-1,4-dioxa-spiro[4.5]deca-6,9-dien-8-yloxy)-ethanol | 55426-93-2 | C11H16O5 | 228.245 |
An enantioselective synthesis of (+)-8′-demethyl ABA (2) is described. The chiral intermediate 7 was prepared by yeast reduction of a substituted monoprotected cyclohexa-2,5-dien-1,4-dione (9) synthesized through a phenol oxidation. The scope and limitations of the phenol oxidation is described. 8′-Demethyl ABA shows ABA-like activity in wheat embryo germination inhibition, showing that the 8′-methyl group is not essential for biological activity. Key words: abscisic acid, phenol oxidation, yeast reduction.