Reactions of cyclic anhydrides XI. A facile approach to pyrrolo-3, 1-benzoxazinones via anilic acids.
作者:V. Balsubramaniyan、N.P. Argade
DOI:10.1016/s0040-4039(00)84563-3
日期:1986.1
:ortho-Carboxymaleanilic acids (I) undergo intramolecular double cyclisation to give pyrrolo-benzoxazinones (II) in excellent yields when treated with sodium acetate-acetic anhydride whereas the corresponding fumaranilic acids (III) under these conditions furnish 3, 1-benzoxazinones (IV.)
acetate-acetic anhydride underwent double cyclisation leading to pyrrolobenzoxazinones Va-g carrying an angular acetate. A one-flask reaction of dimethylmaleic anhydride and phthalicanhydride with anthranilic acid furnished the angular hydroxy benzoxazinones IVh and IVi respectively, which were converted to the corresponding acetates Vh and Vi. The acetates Va, Vc, Vf, Vg and Vi underwent solvolysis to the