作者:Sandra Claeys、Dirk Van Haver、Pierre J. De Clercq、Marco Milanesio、Davide Viterbo
DOI:10.1002/1099-0690(200203)2002:6<1051::aid-ejoc1051>3.0.co;2-#
日期:2002.3
The intramolecular cycloaddition of 14, with dimethylaluminium chloride as a catalyst and under kinetic control, yielded the exo adduct 19a. Opening of the oxygen bridge in the reduced adduct 20 gave intermediate 21. Oxidation of the latter made it possible to introduce the methyl group at C-10, which exclusively afforded 23, with the unnatural configuration. Further conversion resulted in the formation
用二甲基氯化铝作为催化剂并在动力学控制下的分子内环加成反应14,得到外加合物19a。在还原的加合物20中打开氧桥得到中间体21。后者的氧化使得可以在C-10处引入具有非天然构型的甲基,该甲基仅提供23。进一步转换导致d-HOMO -10-形成外延-adrenosterone(25)。(©Wiley-VCH Verlag GmbH,69451 Weinheim,Germany,2002)