Domino Michael-aldol annulations for the stereocontrolled synthesis of bicyclo[3.3.1]nonane and bicyclo[3.2.1]octane derivatives
作者:Rossella Promontorio、Jean-Alexandre Richard、Charles M. Marson
DOI:10.1039/c6ra23523a
日期:——
of cycloalkane-1,3-diones with enals affords a general route to 6-hydroxybicyclo[3.3.1]nonane-2,9-diones and 2-hydroxybicyclo[3.2.1]octane-6,8-diones, notably in one-pot procedures under convenient conditions. The annulation is shown to be compatible with one or more substituents at six positions of the bicyclo[3.3.1]nonane-2,9-dione scaffold. In some cases, the relative configuration of the product
环烷-1,3-二酮与烯醇的多米诺米歇尔-奥尔多环化提供了通向6-羟基双环[3.3.1]壬烷-2,9-二酮和2-羟基双环[3.2.1]辛烷-6,8-的一般途径二酮,特别是在方便条件下的一锅法中。显示该环空与双环[3.3.1]壬烷-2,9-二酮支架的六个位置上的一个或多个取代基相容。在某些情况下,可以通过选择适当的溶剂,碱和温度来控制产品的相对构型。与通常采用的椅子-座椅构型相反,衍生自2,4,4-三甲基环己烷-1,3-二酮的双环化合物具有船-椅子构型。环化产物的氧化得到相应的双环三酮。