Efficient iron-mediated approach to pyrano[3,2-a]carbazole alkaloids—first total syntheses of O-methylmurrayamine A and 7-methoxymurrayacine, first asymmetric synthesis and assignment of the absolute configuration of (−)-trans-dihydroxygirinimbine
作者:Konstanze K. Gruner、Thomas Hopfmann、Kazuhiro Matsumoto、Anne Jäger、Tsutomu Katsuki、Hans-Joachim Knölker
DOI:10.1039/c0ob01088j
日期:——
Iron-mediated oxidative cyclisation provides an efficient approach to pyrano[3,2-a]carbazole alkaloids. Thus, improved routes to girinimbine and murrayacine as well as the firsttotal syntheses of O-methylmurrayamine A and 7-methoxymurrayacine are reported. Asymmetric epoxidation of girinimbine led to (−)-trans-dihydroxygirinimbine and the assignment of its absolute configuration.
铁介导的氧化环化提供了一种有效的方法 吡喃并[3,2- a ]咔唑生物碱。因此,改进了通往吉利比滨报道了尿嘧啶和O-甲基尿嘧啶A和7-甲氧基尿嘧啶的第一批总合成。的不对称环氧化吉利比滨导致了(-)-反式-二羟基基里尼宁及其绝对构型的赋值。