A Concise Synthesis of Furostifoline by Tetrabutylammonium Fluoride-Promoted Indole Ring Formation.
作者:Akito Yasuhara、Naoyuki Suzuki、Takao Sakamoto
DOI:10.1248/cpb.50.143
日期:——
Furostifoline, a furo[3,2-a]carbazole alkaloid, was synthesized in 10% overall yield in four steps from 2-acetyl-3-bromofuran. The key step of this synthesis was the 2-substituted indole formation with tetrabutylammonium fluoride (TBAF) from 2-(2-propenyl)-3-((2-ethoxycarbonylamino)phenylethynyl)furan, which was easily prepared from ethyl 2-ethynylphenylcarbamate with 3-bromo-2-(2-propenyl)furan by
从2-乙酰基-3-溴呋喃分四步以10%的总收率合成了呋喃西林(一种呋喃[3,2-a]咔唑生物碱)。该合成的关键步骤是由2-(2-丙烯基)-3-((2-乙氧基羰基氨基)苯基乙炔基)呋喃与四丁基氟化铵(TBAF)形成2-取代的吲哚,该化合物很容易由2-乙炔基苯基氨基甲酸乙酯与通过Sonogashira反应生成3-溴-2-(2-丙烯基)呋喃。