(-)-α-Cuparenone, (17) was synthesized from the olefinic aldehyde (9) by utilizing a rhodium-catalyzed cyclization as a key step. The optically active aldehyde (7) was prepared by employing an asymmetric [2, 3] sigmatropic rearrangement of a quaternary L-prolinol derivative. The aldehyde (7) was also converted into its antipodal form (24) in several steps.
(-)-α-Cuparenone (17) 是利用
铑催化环化作为关键步骤,从烯烃醛 (9) 合成而来。光学活性醛(7)是通过对一种季
L-脯氨醇衍
生物进行不对称[2,3]西格玛托普重排而制备的。醛 (7) 还可通过几个步骤转化为其反式 (24)。