Stereoselective Route to Oxetanocin Carbocyclic Analogues Based on a [2 + 2] Photocycloaddition to a Chiral 2(5<i>H</i>)-Furanone
作者:Albert Rustullet、Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font
DOI:10.1021/ol0710616
日期:2007.7.1
The synthesis of the trisubstituted cyclobutane 7, which is a suitable precursor for the preparation of oxetanocin carbocyclic analogues, is described. The key step involves a regio- and diastereoselective [2 + 2] photochemical reaction of ketene diethyl acetal with (S)-5-pivaloyloxymethyl-2(5H)-furanone, 3. As an application of this methodology, (-)-cyclobut-A has been prepared from the intermediate
描述了三取代的环丁烷7的合成,所述三取代的环丁烷7是用于制备氧杂环丁菌素碳环类似物的合适的前体。关键步骤涉及乙烯酮二乙基乙缩醛与(S)-5-pivaloyloxymethyl-2(5H)-呋喃酮3的区域和非对映选择性[2 + 2]光化学反应。作为该方法的应用,(-)-环丁酮-A是从中间体7制备的。