Synthesis of N3-Substituted Quinazoline-2,4-diones via C-4 Amination-Cyclization of Isatoic Anhydrides
作者:Wong Phakhodee、Nittaya Wiriya、Dolnapa Yamano、Surat Hongsibsong、Mookda Pattarawarapan
DOI:10.3987/com-22-s(r)10
日期:——
A direct approach for the synthesis of N3-substituted quinazoline-2,4-diones via condensation of isatoic anhydrides with amines mediated by Ph3P-I2 was reported. Instead of the expected benzoxazinones, the reaction proceeds with an amine attack at the C-4 position of isatoic anhydrides leading to quinazoline-2,4-diones upon heating in the presence of base. This one-pot process enables a rapid construction
报道了一种通过由 Ph 3 P-I 2介导的靛红酸酐与胺的缩合来合成N3-取代的喹唑啉-2,4-二酮的直接方法。代替预期的苯并恶嗪酮,该反应在碱存在下加热时在靛红酸酐的 C-4 位发生胺攻击,从而产生喹唑啉-2,4-二酮。这种一锅法可以使用简单、容易获得和低成本的试剂快速构建各种喹唑啉-2,4-二酮衍生物,无需额外的羰基化剂。