Total synthesis of (±)-β-bulnesene via intramolecular cycloaddition of a 2-substituted 3-oxidopyrylium
作者:Steven M. Bromidge、Peter G. Sammes、Leslie J. Street
DOI:10.1039/p19850001725
日期:——
precursor of a 2-substituted 3-oxidopyrylium, which undergoes smooth intramolecular cyclisation to generate a highly functionalised perhydroazulene intermediate. Further chemical manipulation of the latter readily generates the desired natural product. In order to control the relative geometry of the pendent 4-methyl group in the target molecule, a method involving the stereoselective reduction of an exocyclic
描述了到倍半萜烯(±)-β-丁烯的路线,该路线以取代的呋喃2-(1-羟基-4-甲基己基-5-烯基)呋喃开始。后者的氧化产生2-取代的3-氧化oxid的前体,其进行光滑的分子内环化以产生高度官能化的全氢氮杂中间体。后者的进一步化学处理容易产生所需的天然产物。为了控制靶分子中4-甲基侧基的相对几何形状,采用了立体选择性地还原环外亚甲基的方法。详细介绍了引入这种亚甲基的方法。