One-pot and regioselective synthesis of polysubstituted 3,4-dihydroquinazolines and 4,5-dihydro-3H-1,4-benzodiazepin-3-ones by sequential Ugi/Staudinger/aza-Wittig reaction
作者:Jun Xiong、Xiao Wei、Yu-Chen Wan、Ming-Wu Ding
DOI:10.1016/j.tet.2019.01.014
日期:2019.2
efficient one-pot and regioselective synthesis of 3,4-dihydroquinazolines and 4,5-dihydro-3H-1,4-benzodiazepin-3-ones by Ugi/Staudinger/aza-Wittig sequence has been developed. The Ugi reactions of 2-azidobenzylamines, aldehydes, acids (or α-keto acids) and isocyanides produced the azide intermediates, which were then treated with tributylphosphine or triphenylphosphine to give polysubstituted 3,4-dihydroquinazolines
已经开发了通过Ugi / Staudinger / aza-Wittig序列有效地一锅法和区域选择性合成3,4-二氢喹唑啉和4,5-二氢-3 H -1,4-苯并二氮杂-3-酮的方法。2-叠氮基苄胺,醛,酸(或α-酮酸)和异氰酸酯的Ugi反应生成叠氮化物中间体,然后将其用三丁基膦或三苯基膦处理,得到多取代的3,4-二氢喹唑啉或4,5-二氢-3 H通过串联Stander / Aza-Wittig反应,中度至良好产率的-1,4-苯并二氮杂-3-酮。