enone intermediate enables the enantioselective total syntheses of daucene, daucenal, epoxydaucenal B, and 14‐para‐anisoyloxydauc‐4,8‐diene. Central aspects include a catalytic asymmetric alkylation followed by a ring contraction and ring‐closing metathesis to generate the five‐ and seven‐membered rings, respectively.
通过关键的烯酮中间体获得在胡萝卜烷和
酚烷
萜类化合物中发现的
双环[5.3.0]癸烷核心,可以对映体选择性地全合成胡萝卜烯、胡萝卜烯醛、环氧胡萝卜醛B和14-对茴香酰氧基胡萝卜烯-4,8-二烯。核心方面包括催化不对称烷基化,然后进行环收缩和闭环复分解,分别生成五元环和七元环。