Synthesis of Acyclic Nitroazole Nucleosides and Their Incorporation into Oligonucleotides, and Their Duplex and Triplex Formation
作者:Krzysztof Walczak、Michael Wamberg、Erik B. Pedersen
DOI:10.1002/hlca.200490045
日期:2004.2
incorporated into a 26-mer oligonucleotide. UV Thermal melting studies of duplexes of the oligonucleotides with 4-nitropyrazole or 4-nitro-1H-imidazole paired with four natural bases showed moderately decreased stabilities of the duplexes. A narrow range of melting temperatures, typically being within 2° for each acyclic nucleoside, fulfill one of the requirements of using acyclic 4-nitroazoles as general
在催化量的碳酸钾存在下,通过将适当的4-硝基唑亲核加成到(-)-(S)-(羟甲基)环氧乙烷中,合成了4-硝基-1 H-咪唑和4-硝基吡唑的无环核苷。。(+)-(R)-3-(4-硝基-1 H-咪唑-1-基)丙烷-1,2-二醇和(+)-(R)-3-(2-甲基-4-硝基-1 ħ -咪唑-1-基)丙烷-1,2-二醇在一个独立的反应,也得到由合适的1,4-二硝基- 1开始ħ咪唑和(+) - ([R)-3- aminopropane- 1,2-二醇。(+)-(R)-3-(4-硝基吡唑-1-基)丙烷-1,2-二醇也可以通过将4-硝基吡唑直接非催化加成到(-)-(S)-(羟甲基)环氧乙烷中获得,而(S) -对映体通过在Mitsunobu反应条件下使4-硝基吡唑与(+)-(S)-1,2- O-异亚丙基甘油反应,然后用80%的AcOH裂解异亚丙基而获得。尚未观察到任何这些合成过程中的外消旋作用。将3-(4-硝