合成了一系列新颖的腺苷3',5'-环一磷酸(cAMP)类似物,以及它们的6-脱氨基和6-硝基衍生物,其中嘌呤环被吲唑,苯并三唑和苯并咪唑代替。还制备了吲唑和苯并三唑呋喃核糖苷的3',5'-环单磷酸酯,其中糖-磷酸酯部分连接到杂环的N-2氮原子上。通过类似物激活兔骨骼肌中纯化的cAMP依赖性蛋白激酶I(PK-I)和牛心脏中cAMP依赖性蛋白激酶II(PK-II)的能力来测试其生物活性。每个环状核苷酸均能够以2.0 x 10(-8)至4.8 x 10(-6)M的一半最大浓度(Ka)激活两种PK同工酶。N-1-β-D-呋喃呋喃糖基吲唑的环状磷酸酯(13)被证明是对PK-1和PK-II的极弱活化剂,但是当吲唑被N-2结合到核糖上或当C处的氢原子时-4被硝基或氨基取代,类似物的活性大大增加。苯并三唑衍生物的活化能力与cAMP相似,而与C-4取代基无关。发现含有苯并咪唑的环状核苷酸的Ka'值对于PK-
Nucleoside synthesis: A systematic study of the influence of the nature and stereochemistry of d-aldopentofuranoses, and the effect of the substituent at C-2, in the acid-catalyzed fusion-reaction with indazole
作者:Bernard L. Kam、Jean-Louis Barascut、Jean-Louis Imbach
DOI:10.1016/0008-6215(80)90009-9
日期:1980.1
the nature and stereochemistry of the d -aldopentofuranose and the effect of the substituent at C-2 have been investigated by using indazole as a model heterocycle. The results obtained show that the nature and stereochemistry of the starting, per-O-acetylated d -aldopentofuranose have no significant effectupon the productdistribution of the acid-catalyzed fusion-reaction. The use of a sugar lacking
Irreversible, acid-catalyzed 2 --> 1 transglycosylation reactions of fully acetylated beta-D-ribofuranosylindazoles were studied applying HPLC analysis. Results so obtained support the intermolecular mechanism of transglycosylation via a 1,2-diglycosylindazole intermediate and are compared to those of the purine series.