Synthesis of cytosine radiolysis products: cis- and trans-1-carbamoyl-4,5-dihydroxyimidazolidin-2-one
作者:Nelson J. Leonard、David F. Wiemer
DOI:10.1021/ja00441a055
日期:1976.12
Treatment of 3 with OsO/sub 4/ in dry DMF, followed by reductive cleavage with H/sub 2/S, provided the pure cis isomer 1. The structure of the cis isomer was confirmed by observing (by NMR) its conversion to 8 upon treatment with Os/sub 2/O/sub 6/.py/sub 4/. The assignment of /sup 1/H NMR chemical shifts and coupling constants for the intermediates and products were confirmed in part by examination
胞嘧啶..γ..-辐射分解产物顺式和反式-1-carbamoyl-4,5-dihydroxyimidazolidin-2-one(1, 2 作为外消旋修饰)已从常见的前体 1-carbamoyl-4- 合成咪唑啉-2-一 (3)。在吡啶水溶液中用 OsO/sub 4/ 氧化 3 提供中间体 cis-1-carbamoyl-4,5-dihydroxyimidazolidin-2-one 双(吡啶)环状锇酸盐 (8),在用 NaHSO/sub 3 水溶液还原水解后/,然后用 EtOAc 连续萃取,得到反式异构体 2。在无水 DMF 中用 OsO/sub 4/ 处理 3,然后用 H/sub 2/S 还原裂解,提供纯顺式异构体 1。顺式异构体通过观察(通过NMR)在用Os/sub 2/O/sub 6/.py/sub 4/处理后转化为8来证实。