A New Entry to Benzo[4,5]furo[3,2-b]pyridines via N-(Benzofuran-3-yl)iminophosphorane
作者:Maria Funicello、Valeria Laboragine、Rocco Pandolfo、Piero Spagnolo
DOI:10.1055/s-0029-1218551
日期:2010.1
tetrahydro deriva-tives are long-known compounds available through vari-ous reported methods. 4 In contrast, the benzo-[4,5]furo[ b ]pyridine congeners remain little known. In-deed, only scant examples of benzo[4,5]furo[2,3- b ]py-ridines were present in the literature 4b,5c,d until two veryrecent papers described the preparation of a variety ofthose tricyclic compounds through the unusual use of insitu
摘要:烯酮与 N-(苯并呋喃-3-基)亚氨基膦的温和热反应,新制备的 3-叠氮苯并呋喃与三苯基膦的 Staudinger 反应,为几乎未知的苯并 [4,5] 呋喃 [3, 2- b ]吡啶通过串联氮杂-Wittig-电环化过程。关键词:亚氨基膦,叠氮化物,aza-Wittig,电环化,苯并呋喃吡啶 杂环小分子在现代药物和药物化学中发挥着重要作用。1 特别是,苯并 [4,5] 呋喃吡啶类是碳氢化合物和二苯并呋喃的等排化合物,通常表现出重要的生物和药理活性。2,3 苯并[4,5]呋喃[c]吡啶及其四氢衍生物是众所周知的化合物,可通过各种报道的方法获得。4 相比之下,苯并 [4, 5]呋喃[b]吡啶同系物仍然鲜为人知。实际上,文献 4b,5c,d 中只有很少的苯并 [4,5] 呋喃 [2,3-b] 吡啶实例,直到最近的两篇论文描述了通过不寻常地使用原位产生的 2-氨基苯并呋喃作为关键的中间体。