Base-Promoted Chemodivergent Formation of 1,4-Benzoxazepin-5(4H)-ones and 1,3-Benzoxazin-4(4H)-ones Switched by Solvents
作者:Qian Chen、Yunpeng Wang、Ruimao Hua
DOI:10.3390/molecules24203773
日期:——
either 1,4-benzoxazepin-5(4H)-ones or 1,3-benzoxazin-4(4H)-ones in good yields with high selectivity, depending greatly upon the use of solvents. In the case of using DMSO, the intermolecular benzannulation produced seven-membered benzo-fused heterocycles of 1,4-benzoxazepin-5(4H)-ones, whereas in MeCN, the six-membered benzo-fused heterocycles of 1,3-benzoxazin-4(4H)-ones were formed. The KOH-promoted
KOH 促进的邻氟苯甲酰胺与 2-propyn-1-ol 的化学发散苯环化可以以良好的收率提供 1,4-benzoxazin-5(4H)-ones 或 1,3-benzoxazin-4(4H)-ones高选择性,很大程度上取决于溶剂的使用。在使用 DMSO 的情况下,分子间苯并环化产生 1,4-benzoxazepin-5(4H)-ones 的七元苯并稠合杂环,而在 MeCN 中,1,3-benzoxazin 的六元苯并稠合杂环形成了-4(4H)-一个。KOH 促进的苯环化反应最有可能是通过邻氟苯甲酰胺与 2-丙炔-1-醇的 C-F 亲核取代得到邻-[(2-丙炔基)氧基]苯甲酰胺中间体,该中间体在以不同的方式提供七元或六元苯并稠合杂环。