The reactions of (±)-α-epoxy drimenol (4) and (±)-α-epoxy drimenyl cyanide (6) with acids (proton acid or Lewis acid) selectively gave the rearranged aldehyde (±)-13 and (±)-15 having the hydroindane skeleton, respectively, while the reactions of (±)-4 and (±)-6 with Dibal-H selectively afforded the allyl alcohol (±)-14 and (±)-16, respectively. The reactions of (8aR)-6 and (8aS)-6 with Dibal-H were applied for the determination of the absolute structure of natural 7β-acetoxy-ent-labda-8(17),13(14)E-dien-15-ol (18). The reaction of (±)-α-epoxy bicyclofarnesol (5) and (8aS)-5 with proton acid selectively provided the rearranged ketol (±)- and (8aS)-31 having the hydroindane skeleton, respectively. The optically active (8aS)-31 was converted to the natural (9S)-austrodoric acid (33).
(±)-α-环氧地美
酚(4)和(±)-α-环氧地美
酚氰(6)与酸(质子酸或
路易斯酸)的反应分别选择性地得到了以氢
茚为骨架的重排醛(±)-13和(±)-15,而(±)-4和(±)-6与Dibal-H的反应则分别选择性地得到了烯丙基醇(±)-14和(±)-16。(8aR)-6 和 (8aS)-6 与 Dibal-H 的反应被用于确定天然 7β-acetoxy-ent-labda-8(17),13(14)E-dien-15-ol (18) 的绝对结构。(±)-α-环氧双环
法呢醇(5)和(8aS)-5 与质子酸的反应分别选择性地提供了具有氢
茚满骨架的重排酮醇(±)-和(8aS)-31。具有光学活性的 (8aS)-31 被转化为天然的 (9S)-Austrodoric acid (33)。