作者:Jurij Svete
DOI:10.1002/jhet.5570420303
日期:2005.4
3-Aminopyridazines 17 and 3-hydrazinopyridazines 18 were used as building blocks for the preparation of various types of functionalized, pyridazine ring containing compounds. 3-Aminopyridazines were employed in the synthesis of 3-(6-chloroimidazo[1,2-b]pyridazin-2-yl)alanines 26, 27 and for the preparation of 3-amino-4H-pyrimido[1,2-b]pyridazin-4-ones 103, intermediates in the ‘ring switching’ synthesis
3-氨基哒嗪17和3-肼基哒嗪18被用作制备各种类型的官能化的含哒嗪环的化合物的基础。3-氨基哒嗪用于合成3-(6-氯咪唑并[1,2- b ]哒嗪-2-基)丙氨酸26、27,并用于制备3-氨基-4 H-嘧啶基[1,2- b ]哒嗪-4-酮103,中间体烷基1-哒嗪-3-基- 1,2,3-三唑-4-羧酸盐的“环切换”合成106。另一方面,hydrazinopyridazines 18是在采用两步制备3-官能化的1,2,4-三唑[4,3- b通过与官能化醛及其烯胺类似物缩合,然后氧化中间体进行氧化环化而得到]哒嗪。以这种方式,1,2,4-三唑并[4,3- b ]哒嗪-3-基取代的丙氨酸29,30,多元醇33,39-48,Ç核苷49,50,和萜烯,58,62,64 –69准备好了。在另一种一般的方法,3- hydrazinopyridazines 18用官能化烯胺酮1,3- dielectrop