Nucleosides. Part LVI. Aminolysis of carbamates of adenosine and cytidine
作者:Harald Sigmund、Wolfgang Pfleiderer
DOI:10.1002/hlca.19940770509
日期:1994.8.10
towards the elucidation of the reaction mechanism indicate that the aminolysis proceeds via an addition-elimination or an isocyanate mechanism, depending on the reaction conditions. The phenoxycarbonyl (phoc) group at N6 or N4 was chosen to study the mild conversion of carbamates with aromatic amines into ureas of adenosine and cytidine, respectively.
1984年引入的2-(4-硝基苯基)乙氧基羰基(npeoc)基团是核酸碱基的环外氨基官能团的保护基,在温和的条件下与胺反应生成脲衍生物。在室温下用NH 3 / MeOH处理2',5'-二-O-乙酰基-N 6- [2-(4-硝基苯基)乙氧基羰基] cordycepin(3)过夜,得到虫草素(4)和N 6-氨基甲酰基cordycepin (5)。对阐明反应机理的初步研究表明,氨解通过取决于反应条件的加成消除或异氰酸酯机理。选择N 6或N 4处的苯氧羰基(phoc)基团来研究氨基甲酸酯与氨基甲酸酯的温和转化分别为腺苷和胞苷的脲。