申请人:Shire US Inc.
公开号:EP1700841A2
公开(公告)日:2006-09-13
Methods are provided for making certain 6,7-dihalo-1,5-dihydroimidazo [2,1-b] quinazolin-2 (3H) -ones from 2,3-dihalobenzaldehydes. A method is also provided for making the intermediate ethyl N-(2,3-dihalo-6-nitrobenzyl)glycines from 2,3-dihalobenzaldehydes and for reducing the glycine compounds using either SnCl2 or a specially defined catalyst. A cyclization method to form the desired 6,7-dihalo-1,5-dihydroimidazo[2,1-b]quinazolin-2(3H)-ones from the corresponding iminoquinazoline compounds is further provided. These methods are particularly suitable in the manufacture of Anagrelide base.
本发明提供了从 2,3-二卤苯甲醛制取某些 6,7-二卤-1,5-二氢咪唑并[2,1-b]喹唑啉-2 (3H) -酮的方法。此外,还提供了一种从 2,3-二卤代苯甲醛制取中间体 N-(2,3-二卤-6-硝基苄基)乙基甘氨酸的方法,以及使用 SnCl2 或特别定义的催化剂还原甘氨酸化合物的方法。还提供了一种环化方法,可从相应的咪唑喹啉化合物中生成所需的 6,7-二卤-1,5-二氢咪唑并[2,1-b]喹唑啉-2(3H)-酮。这些方法尤其适用于生产阿那格雷碱。