Reactions of 3-(polyfluoroacyl)chromones with hydroxylamine: synthesis of novel RF-containing isoxazole and chromone derivatives
作者:Vyacheslav Ya. Sosnovskikh、Vladimir S. Moshkin、Mikhail I. Kodess
DOI:10.1016/j.tet.2008.06.041
日期:2008.8
Reaction of 3-(polyfluoroacyl)chromones with hydroxylamine free base proceeds via nucleophilic 1,4-addition followed by opening of the pyrone ring and subsequent cyclization to 4-(polyfluoroalkyl)-4H-chromeno[3,4-d]isoxazol-4-ols in good yields. On treatment with trifluoroacetic acid, the isoxazole ring of this annulated heterocyclic system opens to give 3-cyano-2-(polyfluoroalkyl)chromones, which
3-(多氟酰基)发色酮与羟胺游离碱的反应通过亲核的1,4-加成反应进行,随后打开吡喃环并随后环化为4-(多氟烷基)-4 H-苯并[3,4- d ]异恶唑- 4-醇收率良好。用三氟乙酸处理时,该环状杂环系统的异恶唑环打开,得到3-氰基-2-(聚氟烷基)色酮,将其成功地用浓H 2 SO 4水解,得到3-氨基甲酰基-2-(聚氟烷基)色酮。 。另一方面,用羟胺盐酸盐对3-(聚氟酰基)色酮进行肟化反应是在与R F基团相连的羰基碳原子上或在C-2原子上发生的,从而得到3-R F。C(NOH)-色酮和5-R F -4-水杨酸异恶唑肟。通过简单地在二甲基亚砜中加热,将前者容易地转化为3-R F -4-水杨酸异恶唑。