Substituted 2,2′-bipyrroles and pyrrolylfurans via intermediate isoxazolylpyrroles
作者:James H. Frederich、Jennifer K. Matsui、Randy O. Chang、Patrick G. Harran
DOI:10.1016/j.tetlet.2013.03.034
日期:2013.5
promoted cyclization afford roseophilin segment 3b in five steps and 19% overall yield. This strategy was extended to the synthesis of 3-chloro-(4′-alkoxy)-2,2′-pyrrolylfurans (16a–c) and 4-alkoxy-2,2′-bipyrroles (20a–c), which are building blocks to synthesize bioactive prodiginine natural products and their congeners.
我们描述了(+)-roseophilin的 3-氯-(4'-甲氧基)-2,2'-吡咯基呋喃片段 ( 3 ) 的新合成。该路线利用异恶唑基吡咯中间体,其中异恶唑环用作 β-二酮等价物和钯催化氯化所连接的吡咯的导向基团。随后 N-O 键的还原和酸促进的环化分五步提供了玫瑰亲和素片段3b,总产率为 19%。该策略扩展到 3-氯-(4'-烷氧基)-2,2'-吡咯基呋喃 ( 16a - c ) 和 4-烷氧基-2,2'-联吡咯 ( 20a - c ) 的合成块以合成具有生物活性的 prodiginine 天然产物及其同系物。