Imidazopyridine and pyrimidinopyridine systems from perfluorinated pyridine derivatives
作者:Matthew W. Cartwright、Graham Sandford、Jamaal Bousbaa、Dmitrii S. Yufit、Judith A.K. Howard、John A. Christopher、David D. Miller
DOI:10.1016/j.tet.2007.05.016
日期:2007.7
gave a [6,6]-fused pyrimidinopyridine system arising from initial nucleophilic substitution at the C-3 position of the pyridine ring followed by intramolecular cyclization onto the pendant cyano group. The systems prepared by this annelation methodology further demonstrate the utility of perfluorinated heterocyclic substrates for the synthesis of heterocyclic scaffolds that possess multiple functionality
通过分子内亲核芳族取代过程与苯甲idine胺进行五氟吡啶退火,可分两步以高收率得到咪唑并吡啶体系,而烷基am通过竞争性消除反应得到4-氨基四氟吡啶。4-苯基磺酰基四氟吡啶与am反应生成相应的咪唑并[4,5- b]吡啶体系。相反,4-氰基四氟吡啶产生[6,6]-融合的嘧啶二吡啶体系,这是由于在吡啶环的C-3位置发生了最初的亲核取代,随后分子内环化到了氰基侧基上。通过这种脱核方法制备的系统进一步证明了全氟化杂环底物在合成具有多种功能并在药物发现领域具有潜在应用的杂环支架上的实用性。