Regioselective Preparation of 2-Substituted 3,4-Diaryl Pyrroles: A Concise Total Synthesis of Ningalin B
作者:James L. Bullington、Russell R. Wolff、Paul F. Jackson
DOI:10.1021/jo026445i
日期:2002.12.1
nitriles to provide a regioselective synthesis of 2-substituted 3,4-diaryl pyrroles. The ease of preparation of alpha,beta-unsaturated nitriles allows the rapid synthesis of pyrroles with varied substituents. Using this method, a key intermediate (1) for the synthesis of the marine natural products lukianol A, lamellarin O, and lamellarin Q was prepared in two steps. A total synthesis of ningalin B (11)
异氰基乙酸甲酯与α,β-不饱和腈进行2 + 3环加成反应,从而提供2-取代的3,4-二芳基吡咯的区域选择性合成。易于制备的α,β-不饱和腈可快速合成具有各种取代基的吡咯。使用这种方法,分两步制备了用于合成海洋天然产物卢卡诺醇A,层状薄层蛋白O和层状薄层蛋白Q的关键中间体(1)。利用这种方法还可以完成宁纳林B(11)的全合成。