Pteridines. Part CXVIII
作者:Gerhard Heizmann、Wolfgang Pfleiderer
DOI:10.1002/hlca.200790195
日期:2007.10
(43), prepared from N-(4-bromophenyl)benzamide (47) via49 and 50 to give 1-4-1-[2-amino-7-methyl-4-(1-methylethoxy)pteridin-6-yl]ethyl}amino}phenyl}-1-deoxy-D-ribitol (44) in 62% yield (Scheme 3). Acid cleavage of the isopropylidene groups at room temperature led to 45 and on boiling to 1-4-[1-(2-amino-3,4-dihydro-7-methyl-4-oxopteridin-6-yl)ethyl]amino}phenyl}-1-deoxy-D-ribitol (46). The next step
我们的部分合成甲烷蝶呤(1)的方法是从6-乙酰基-O 4-异丙基-7-甲基蝶呤(20)开始的,这是通过从6-异丙氧基嘧啶-2,4,5-三胺(19)缩合获得的。和戊烷-2,3,4-三酮(6)或6-异丙氧基-5-亚硝基嘧啶-2,4-二胺(21)和戊烷-2,4-二酮(=乙酰丙酮;22)(方案2)。将NaBH 4还原为20会生成6-(1-羟乙基)-O 4-异丙基-7-甲基蝶呤(23),将其转化为相应的6-(1-氯乙基)和6-(1-溴乙基)衍生物24和25。进行了一系列侧链和位置4的亲核取代反应,作为模型反应,得到26 – 29、32 – 35和39 – 41。的取代基的水解在C(4)引导到对应的蝶呤衍生物30,31,36 - 38,和42。类似地,25与由N制备的1-(4-氨基苯基)-1-脱氧-2,3:4,5-二-O-异亚丙基-D-核糖醇反应(43)-(4-溴苯基)苯甲酰胺(47)通过49和50得到1-