A Novel and Efficient Synthesis of 4<i>H</i>-3,1-Benzoxazines by a Tandem Aza-Wittig/Heterocumulene-Mediated Annulation Strategy
作者:Pedro Molina、Antonio Arques、Angel Molina
DOI:10.1055/s-1991-26368
日期:——
2-[(Triphenylphosphoranylidene)amino]benzyl alcohol 2 reacts with isocyanates or isothiocyanates in refluxing toluene to give the corresponding 2-alkyl(aryl)amino-4H-3,1-benzoxazines 5. Iminophosphorane 2 also reacts with carbon dioxide and carbon disulfide to give 4H-3,1-benzoxazin-2(1H)-one (6) and -thione (7), respectively.
2-[(三苯基正膦亚基)氨基]苯甲醇2与异氰酸酯或异硫氰酸酯在回流甲苯中反应,得到相应的2-烷基(芳基)氨基-4H-3,1-苯并恶嗪5。亚氨基正膦2也与二氧化碳和二硫化碳反应分别得到4H-3,1-苯并恶嗪-2(1H)-酮(6)和-硫酮(7)。