Synthesis of pteridine derivatives related to folic acid and methanopterin from pyrazine-2,3-dicarbonitrile
作者:Masaru Tada、Yasuhiro Asawa、Mamoru Igarashi
DOI:10.1002/jhet.5570340341
日期:1997.5
Pteridine derivatives related to folic acid and methanopterin were synthesized by two methods. The first synthesis is initiated by the radical substitution of 5-methylpyrazine-2,3-dicarbonitrile (3) with the (N-acylanilino)alkyl radical to give 6-methyl-5-(N-acylanilino)alkylpyrazine-2,3-dicarbonitrile (9) and was followed by the substitution of the 2-carbonitrile with methylamine and further conversion
通过两种方法合成了与叶酸和甲烷蝶呤有关的蝶啶衍生物。第一步合成是通过将5-甲基吡嗪-2,3-二腈(3)自由基取代成(N-酰基丙氨基)烷基,得到6-甲基-5-(N-酰基丙氨酸基)烷基吡嗪-2,3- (9),然后用甲胺取代2-甲腈,并进一步转化为1-甲基-2-氨基-6-(N-酰基丙氨酸)-烷基-7-甲基蝶啶-4(1 H)-亚胺11在胍的作用下。第二种方法是通过将5-甲基吡嗪-2,3-二腈(3)进行羟甲基化而得到5-羟基-甲基-6-甲基吡嗪-2,3-二腈(15),然后氧化羟甲基,N-苯基亚胺化,以及用甲胺取代2-甲腈,得到6-甲基-2-甲基-氨基--5- (N-苯基亚氨基)亚甲基吡嗪-3-甲腈(18)。亚氨基的还原和胍的最终环化得到2-氨基-6-苯胺基甲基-1,7-二甲基蝶啶-4(1 H)-亚胺(20)。