Starting from 2', 3'-isopropylidene-8, 5'-anhydro-8-mercaptoinosine (II), synthesized from the corresponding adenosine derivative (I) by deamination with sodium nitrite, various 6-substituted analogs were synthesized. Compound (II) was converted to 6-chloropurine derivative (III) by the reaction with POCl3 and tri-n-butylamine at refluxing temperature in 75% yield. Compound (III) was allowed to react either with methylamine, dimethylamine or sodium methylmercaptide to give N6-methyl (IV), N6-dimethyl (IX) and 6-methylmercapto (X) derivatives, respectively. Ultraviolet spectrum, circular dichroism and mass spectra of these compounds are listed. Compound (IV) was alternatively obtained by a Dimroth type rearrangement of N1-methyl derivative of I by heating in sodium hydroxide solution at pH 8-9. The same type of rearrangement occured also with unprotected 1-methyladenosine-8, 5'-S-cyclonucleoside to give compound (VIII).
从2'、3'-异丙叉-8,5'-脱
水-8-巯基
肌苷(II)开始,通过用
亚硝酸钠脱
氨基,从相应的
腺苷衍
生物(I)合成各种6-取代的类似物。化合物(II)通过与POCl3和
三正丁胺在回流温度下反应转化为
6-氯嘌呤衍
生物(III),产率为75%。化合物(III)与
甲胺、
二甲胺或甲基
硫醇
钠反应,分别得到N6-甲基(IV)、N6-二甲基(IX)和6-巯基(X)衍
生物。这些化合物的紫外光谱、圆二色性和质谱图如下。化合物(IV)也可以通过在pH值为8-9的
氢氧化钠溶液中加热I的N1-甲基衍
生物,进行Dimroth型重排来获得。未保护的1-甲基
腺苷-8,5'-S-环核苷也发生了相同类型的重排,得到化合物(VIII)。