Synthesis of (3<i>S</i>)-Hydroxyandrosta-5,7-diene-17-ones via Intramolecular Cobalt-Mediated [2+2+2] Cycloaddition
作者:Ulrich Groth、Norbert Richter、Aris Kalogerakis
DOI:10.1055/s-2006-939064
日期:——
A new method for the synthesis of lumisterin-type steroids following the D→ABCD approach is reported. A key step is the cobalt-induced cyclization of a cyclopentanoid enediyne, which was prepared via thioalkylation of the zinc enolate of a 2,3-substituted cyclopentanone with α-chlorosulfides.
报道了一种按照 D→ABCD 方法合成 lumisterin 型类固醇的新方法。一个关键步骤是环戊烷烯二炔的钴诱导环化,它是通过 2,3-取代环戊酮的烯醇锌与 α-氯硫化物的硫代烷基化制备的。