Control of Olefin Geometry in the Bryostatin B-Ring through Exploitation of a <i>C</i><sub>2</sub>-Symmetry Breaking Tactic and a Smith−Tietze Coupling Reaction
作者:Karl J. Hale、Marc G. Hummersone、Gurpreet S. Bhatia
DOI:10.1021/ol005850y
日期:2000.7.1
A completely stereocontrolled asymmetric synthesis of an advanced B-ring synthon for the bryostatin family of antitumor agents is reported. Noteworthy features of our synthesis include the Smith-Tietze bis-alkylation reaction between 12 and 13 en route to C(2)-symmetrical ketone 10 and the totally stereoselective conversion of 10 into triol 18 via a Grignard addition tactic. Triol 18 was converted
据报道,用于bryostatin家族的抗肿瘤药物的高级B环合成子的完全立体控制的不对称合成。我们的合成的值得注意的特征包括在12和13之间的Smith-Tietze双烷基化反应,途中到达C(2)对称的酮10,以及通过格利雅(Grignard)加成策略将10完全立体选择性地转化为三醇18。三醇18在9个步骤中转化为环氧化物3,酸催化的分子内威廉姆森醚化反应完成了2的合成。