Medium size bicyclic ethers of 7-, 8-, and 9-membered rings were synthesized by connection between a hydroxy group on dihydropyranyl ring and a propargylic cation that was stabilized as an acetylene biscobalthexacarbonyl complex under acidic conditions. This cyclization selectively afforded the syn-trans bicyclic ring system often seen in marine toxins such as ciguatoxin.
合成了中等大小的7、8和9成员环的双
环醚,通过
二氢吡啶环上的羟基与在酸性条件下以
炔烃双戊庐六羰基复合物稳定的炔基阳离子之间的连接。该环化选择性地生成了在海洋毒素(如西古瓦毒素)中常见的顺反双环环系。