A new strategy for the preparation of 11-oxygenated steroids synthesis of (±)-adrenosterone
作者:Paul A. Grieco、Scott A. May、Michael D. Kaufman
DOI:10.1016/s0040-4039(98)01526-3
日期:1998.9
Conjugate 1,4-addition of 1-[(tert-butyldimethylsilyl)oxy]-2-methyl-1,3-cyclohexadiene (5) to 2-methyl-cyclopentenone in highly polar media and subsequent alkylation of the resultant silyl enol ether (4) with phenylthiodienyl carbonate 10 in 5.0 M LiClO4·Et2O provides substrate 2. Exposure of 2 to TMSOTf/TMSOCH2CH2OTMS affords tetracyclic bis-ketal 3, which is converted into (±)-adrenosterone (1) in
在高极性介质中将1-[(叔丁基二甲基甲硅烷基)氧基] -2-甲基-1,3-环己二烯(5)与4-甲基环戊烯酮进行1,4-加成反应,然后将所得甲硅烷基烯醇醚烷基化4)用5.0M LiClO 4 ·Et 2 O中的碳酸苯硫基二烯基酯10提供底物2。将2暴露于TMSOTf / TMSOCH 2 CH 2 OTMS中得到四环双缩酮3,该四缩双缩酮3可通过四个步骤转化为(±)-肾上腺素(1)。