A novel crystal modification of the compound 2,4-diamino-6-hydroxymethylpteridine hydrobromide and a process for its preparation and its use for preparing methotrexate. The novel crystal modification of 2,4-diamino-6-hydroxymethylpteridine hydrobromide is distinguished in particular by the fact that only one equivalent of the brominating agent triphenylphosphine dibromide is needed for brominating the 6-hydroxymethyl group. No reaction with the amino groups in the 2 and 4 positions takes place. This facilitates the reaction to give 2,4-diamino-6-pteridinyl derivatives such as methotrexate.
一种新的2,4-二
氨基-6-羟甲基喋呤盐酸盐晶体的修饰,以及其制备和用于制备
甲氨蝶呤的方法。该新的2,4-二
氨基-6-羟甲基喋呤盐酸盐晶体的特点在于,仅需要一当量的
溴化试剂
三苯基膦二
溴化物来
溴化6-羟甲基基团。不会与2和4位的
氨基发生反应。这有利于反应生成2,4-二
氨基-6-喋呤基衍
生物,如
甲氨蝶呤。