Upon treatment with tBuOK/H2O, a variety of ω-halo-β-keto-ketals undergo smooth cyclisation, affording in excellent yields mono-protected [n,m] spiro bicyclic diketones. This transformation is highly stereoselective producing, in all cases, the diastereoisomerically pure spiro derivatives.
用t BuOK / H 2 O处理后,各种ω-卤代-β-酮
缩酮均进行平滑环化,从而以优异的收率得到单保护的[n,m]螺双环二酮。在所有情况下,这种转化都是高度立体选择性的,产生非对映异构纯的螺衍
生物。