A series of 2,3-disubstituted-1,3-benzoxazines was synthesized by trimethyl chlorosilane-catalyzed aza-acetalization of 2-arylaminomethyl phenols with aromatic aldehydes. The structures of the prepared compounds were characterized by FT-IR,1H NMR,13 C NMR and elemental analysis. Fungicidal activities of these compounds were also evaluated. Most of them exhibit good activities. Compound 6e shows 79% and77. 9% activity against S. Scleratotiorum and B. Cinérea,respectively. Compounds...