Synthesis of enantiopure (S)-7-hydroxy-3-amino-3,4-dihydro-2H-1-benzopyran en route to (+)-scyphostatin
作者:Emmanuel N. Pitsinos、Vassilios I. Moutsos、Olga Vageli
DOI:10.1016/j.tetlet.2007.01.006
日期:2007.2
(S)-7-Hydroxy-3-amino-3,4-dihydro-2H-1-benzopyran, a key synthetic intermediate towards the total synthesis of (+)-scyphostatin, has been prepared in >98% ee. Key synthetic steps were (i) the oxidative dearomatization of an l-tyrosine derived phenol, (ii) the transformation of the resulting p-quinol acetate to the corresponding resorcinol upon exposure to Thiele reaction conditions and, (iii) the direct
(S)-7-羟基-3-氨基-3,4-二氢-2 H -1-苯并吡喃是(+)-鞘磷脂的全合成的关键合成中间体,已在> 98%ee中制备。关键的合成步骤是(i)酪氨酸衍生的苯酚的氧化脱芳香化作用;(ii)暴露于Thiele反应条件下,将生成的对苯二酚乙酸酯转化为相应的间苯二酚;以及(iii)直接形成用甲醇钠处理N- Boc保护的4-(2-乙酰氧基苄基)恶唑烷-2-酮时,形成苯并吡喃环。