A simple one-pot procedure is described for the preparation of spiro[4.4]nonane-2,7-dione derivatives from open chain bis(α-diazoketones) by two consecutive intramolecular Rh(II)-catalyzed carbenoid insertion reactions. With 1-diazo-4-(3-oxocycloalkyl)butan-2-ones as substrates, the methodology provides 2,7-dioxospiranes with a cyclopentane ring spiroannulated onto a five-, six- or seven-membered cycloalkane.
描述了一种简单的一锅法,通过两次连续的分子内Rh(II)催化的羧基插入反应,从开放链的双(α-
叠氮酮)中合成spiro[4.4]非烯-2,7-二酮衍
生物。以1-
叠氮-4-(3-氧代环烷基)丁-2-酮为底物,该方法提供了具有
环戊烷环的2,7-二氧杂螺烷,
环戊烷环与五、六或七元环
烷烃螺接。