申请人:Ciba-Geigy Corporation
公开号:US04480106A1
公开(公告)日:1984-10-30
Compounds of the formula I ##STR1## in which R, R.sub.1 and R.sub.2 are as defined in patent claim 1, can be prepared by a novel process, for example by treating a salt of imidazo[1,2-a]pyridin-2(3H)-one with fumaric acid, maleic acid or maleic anhydride, in the presence of a base, and converting the product to a salt of 3-(1,2-dicarboxyethyl)-imidazo[1,2-a]pyridin-2(3H)-one, in the presence of a strong acid, reacting the latter salt with a compound CH.sub.2 =C(R.sub.1)(R.sub.2) and treating the intermediate obtained with glacial acetic acid and sodium acetate. The compounds (I) can be converted, in a manner known per se, to corresponding imides having functional groups suitable for polymerization reactions of polycondensation reactions. These imides can be used to prepare photocrosslinkable polymers. The anhydrides (I) can also be used, in some cases, to prepare pharmaceutically active benzofuranones and homosalicylic acids by reaction with salts of suitable amines.
公式I的化合物##STR1##,其中R、R.sub.1和R.sub.2如专利权要求1中所定义,可以通过一种新颖的方法制备,例如通过在碱的存在下,用富马酸、马来酸或马来酸酐处理咪唑并[1,2-a]吡啶-2(3H)-酮的盐,并将产物转化为3-(1,2-二羧基乙基)-咪唑并[1,2-a]吡啶-2(3H)-酮的盐,在强酸的存在下,将该盐与化合物CH.sub.2=C(R.sub.1)(R.sub.2)反应,并用冰乙酸和乙酸钠处理所得的中间体。这些化合物(I)可以按照已知的方式转化为具有适合于聚合反应或聚合缩合反应的功能基团的相应亚酰胺。这些亚酰胺可以用于制备光交联聚合物。在某些情况下,酸酐(I)也可以与适当胺的盐反应,制备具有药理活性的苯并呋喃酮和同羟基水杨酸。