Regioselective Functionalization of Guanine: Simple and Practical Synthesis of 7- and 9-Alkylated Guanines Starting from Guanosine
作者:Jože Kobe、Genadiy Kalayanov、Suzana Jakša、Tommaso Scarcia
DOI:10.1055/s-2004-829174
日期:——
Reaction of N 2-acetyl-9- and/or -7-benzylated guanines 8 and 12 with selected alkylating agents in 1-methyl-2-pyrrolidone at 120 °C yielded the guaninium salts 9 and 13. The salts were consequently transformed by phase transfer hydrogenation into N7- and N9-isomers 10 and 14, respectively, in a highly regioselective manner. A convenient deoxygenation of both derivatives, achieved via the corresponding O 6-arenesulfonates, into 2-aminopurine potential prodrugs was also established.
N-2-acetyl-9-和/或-7-苄基化鸟嘌呤8和12与选定的烷基化试剂在120°C的1-甲基-2-吡咯烷酮中反应,得到鸟碱盐9和13。随后,这些盐通过相转移氢化反应,分别以高度选择性的方式转化为N7-和N9-同分异构体10和14。此外,还建立了一种便利的去氧化反应,通过相应的O6-芳烃磺酸酯,将这两种衍生物转化为2-氨基嘌呤的潜在前药。