Efficient Synthesis of 2,3-Disubstituted-1,3-benzoxazines by Chlorotrimethylsilane-Mediated Aza-Acetalizations of Aromatic Aldehydes
作者:Zilong Tang、Zhonghua Zhu、Lin Yan、Shuhong Chang、Hanwen Liu
DOI:10.1002/jhet.1590
日期:2013.8
3‐benzoxazines were prepared in moderate to good yields by aza‐acetalizations of aromatic aldehydes with 2‐(N‐substituted aminomethyl)phenols in the presence of chlorotrimethylsilane or SnCl4. It was found that chlorotrimethylsilane was more effective for the reaction, especially for the reaction of fluorobenzaldehyde, and thereby, an efficientmethod for the preparation of 3,4‐dihydro‐2H‐1,3‐benzoxazines
一系列新颖的取代的3,4-二氢-2- ħ -1,3-苯并恶嗪在中度至良好的产率通过芳香醛与2-氮杂- acetalizations制备(ñ -取代氨基甲基)三甲基氯硅烷在或的SnCl存在酚4。发现氯三甲基硅烷对反应更有效,特别是对于氟苯甲醛的反应,因此,开发了一种有效的制备3,4-二氢-2 H -1,3-苯并恶嗪的方法。化合物的结构通过FT-IR,1 H NMR,13 C NMR,MS和元素分析确定。