Nitro derivatives of 1,3-dihydrobenzimidazol-2-one: II. Rearrangement of N-nitrobenzimidazol-2-ones
作者:E. V. Tatarnikova、V. V. Sizov、A. V. Aleksandrov、I. V. Tselinskii
DOI:10.1134/s1070428009100170
日期:2009.10
N-Nitrobenzimidazol-2-ones readily undergo rearrangement to C-nitro derivatives on heating in various solvents (ethyl acetate, butyl acetate, acetonitrile, acetone, dioxane, o-dichlorobenzene, anisole, acetic acid). This rearrangement was used to develop a procedure for the synthesis of 4,5,6,7-tetranitro-1,3-dihydrobenzimidazol-2-one in high yield (90–96%) by nitration of 1,3-dihydrobenzimidazol-2-one
N-硝基苯并咪唑-2-酮在各种溶剂(乙酸乙酯,乙酸丁酯,乙腈,丙酮,二恶烷,邻二氯苯,苯甲醚,乙酸)中加热后,很容易重排为C-硝基衍生物。该重排用于开发通过硝化1,3-二氢苯并咪唑-2合成高产率(90-96%)的4,5,6,7-四硝基-1,3-二氢苯并咪唑-2-酮的方法-1以及5,6-二硝基-和4,5,6-三硝基-1,3-二氢苯并咪唑-2-酮,在与乙酸酐和乙酸混合的混合物中少量过量的浓硝酸50–60°C。