作者:David M. Williams、Dmitry Yu. Yakovlev、Daniel M. Brown
DOI:10.1039/a606472h
日期:——
The synthesis of
9-methylpyrrolo[4,3,2-de]pyrimido
[4,5-c]dihydrooxazepine 34, a
tricyclic
pyrrolo[2,3-d]pyrimidine
analogue of the mutagenic purine
N6-hydroxyadenine, and several novel
pyrrolo[2,3-d]pyrimidines is
described. The presence of the third ring constrains the amino
substituent of 34 to an anti orientation and is
expected to improve dramatically the base-pairing characteristics of the
analogue with both cytosine and thymine when present in DNA. An
intramolecular cyclisation reaction of
5-(aminooxyethyl)-4-chloro-7-methyl-2-methylsulfonyl-7H
-pyrrolo[2,3-d]pyrimidine
30 gave 33, which was converted into the target molecule 34 via
the displacement of the methylsulfonyl group with hydrazine
followed by oxidation of the hydrazino group with mercuric oxide. An
analogous cyclisation with
5-(aminooxyethyl)-4-chloro-7-methyl-7H-pyrrolo
[2,3-d]pyrimidine 31 was less
effective, whilst the corresponding 2-amino derivative 32 failed to
cyclise.
的合成
9-甲基吡咯并[4,3,2-去]嘧啶基
[4,5-c]二氢氧氮杂卓34,a
三环
吡咯并[2,3-d]嘧啶
突变嘌呤的类似物
N6-羟基腺嘌呤,以及一些新颖的
吡咯并[2,3-d]嘧啶是
描述的。第三个环的存在限制了氨基
34的取代基为反方向,并且是
预计将显着改善碱基配对特性
当存在于 DNA 中时,与胞嘧啶和胸腺嘧啶类似。一个
分子内环化反应
5-(氨氧基乙基)-4-氯-7-甲基-2-甲基磺酰基-7H
-吡咯并[2,3-d]嘧啶
30 得到 33,通过以下方式将其转化为目标分子 34
甲磺酰基被肼取代
然后用氧化汞氧化肼基。一个
类似的环化作用
5-(氨氧基乙基)-4-氯-7-甲基-7H-吡咯并
[2,3-d]嘧啶31 较少
有效,而相应的2-氨基衍生物32却未能
骑自行车。