Spiro[4.4]nonane-, spiro[4.5]decane- and spiro[4.6]undecane-α,βâ²-diones have been prepared from 1-diazo-4-(2,2-ethylenedioxycycloalkan-1-yl)butan-2-one intermediates by Rh2(OAc)4- and Rh2(TPA)4-catalyzed CâH insertions. Competitive insertions also gave trans-bicyclic derivatives. The relative stereochemistry in bicyclic derivatives has been determined by single crystal X-ray analyses.
通过 Rh2(OAc)4- 和 Rh2(
TPA)4- 催化的 CâH 插入反应,从 1-重氮-4-(2,2-亚乙二氧基环烷-1-基)丁-2-酮中间体制备了螺[4.4]
壬烷、
螺[4.5]癸烷和螺[4.6]
十一烷δ,δ²â²-二酮。竞争性插入也产生了反式双环衍
生物。通过单晶 X 射线分析,确定了双环衍
生物的相对立体
化学结构。