Purines. XLVIII. Syntheses and proton nuclear magnetic resonance study of 2-deuterioadenines substituted or unsubstituted at the 9-position and of their N-oxygenated derivatives.
作者:Tozo FUJII、Tohru SAITO、Kyoko KIZU、Hiromi HAYASHIBARA、Yukinari KUMAZAWA、Satoshi NAKAJIMA、Tetsunori FUJISAWA
DOI:10.1248/cpb.39.301
日期:——
A detailed account is given of the syntheses of 9-alkyl-2-deuterioadenines (5b-d), adenosine-2-d (5e), and 2'-deoxyadenosine-2-d (5f) from the 9-substituted adenines 1b-f through cyclization of the aminoimidazolecarbox-amidine salts 9 or the corresponding free bases 8 with formic-d acid-d or 1-(formyl-d)-2(1H)-pyridone. Glycosidic hydrolysis of 5e with boiling 0.5N aqueous HCl afforded adenine-2-d (5a) in 77% yield. Peracid oxidation of 5a-e produced the corresponding 1-N-oxides (12a-e) in fair yields. Methylation of 9-methyl- (12b) and 9-benzyladenine-2-d 1-oxide (12d) and adenosine-2-d 1-oxide (12e) with MeI in AcNMe2 gave the corresponding 1-methoxy derivatives (13b, d, e) in good yields. Dimroth rearrangements of 13b, 13d, and 13e via the free bases 14b, 14d, and 14e furnished the N6-methoxy isomers 15b, 15d, and 15e, but their isotopic purities were unsatisfactory. Unambiguous assignments of the purine-ring proton signals in the proton nuclear magnetic resonance spectra of the unlabeled adenines (1a-f, 2a-e, 3b, d, and 10e) have been made by comparison with those of the labeled species (5a-f, 12a-e, 13b, d, and 14e).
详细描述了通过对氨基咪唑羧氨盐9或相应游离碱8与氨基甲酸-氘或1-(甲酰氘)-2(1H)-吡啶酮的环化,从9-取代腺苷1b-f合成9-烷基-2-氘腺苷(5b-d)、腺苷-2-d(5e)和2'-脱氧腺苷-2-d(5f)。用沸腾的0.5N盐酸水解5e,得到腺苷-2-d(5a),产率为77%。对5a-e进行过氧酸氧化,得到了相应的1-N-氧化物(12a-e),产率较好。用甲基碘(MeI)在二甲基乙腈(AcNMe2)中对9-甲基(12b)、9-苄腺苷-2-d 1-氧化物(12d)和腺苷-2-d 1-氧化物(12e)进行甲基化,得到了相应的1-甲氧基衍生物(13b、d、e),产率良好。通过游离碱14b、14d和14e对13b、13d和13e进行Dimroth重排,得到了N6-甲氧基异构体15b、15d和15e,但其同位素纯度不尽如人意。通过与标记物种(5a-f、12a-e、13b、d和14e)进行比较,明确分配了未标记腺苷(1a-f、2a-e、3b、d和10e)在质子核磁共振谱中的嘌呤环质子信号。