Synthesis of 8-methyl-6-thio-7-(β-<scp>D</scp>-xylopyranosyl)theophylline. Conformational study of its peracetyl derivatives. Molecular mechanics calculations and minimum-energy geometries of 8-methyl-7-(2′,3′,4′-tri-O-acetyl-β-<scp>D</scp>-xylopyranosyl)theophylline and 8-methyl-6-thio-7-(2′,3′,4′-tri-O-acetyl-β-<scp>D</scp>-xylopyranosyl)theophylline
作者:Rodrigo Rico-Gómez、Juan Manuel López-Romero
DOI:10.1039/p19940003001
日期:——
The synthesis of a thioxanthine nucleoside, 8-methyl-6-thio-7-(β-D-xylopyranosyl)theophylline, is reported. The triacetyl derivatives, 3 and 4, exhibit major molecular crowding and restricted rotation about the glycoside bond. The stability of the rotamers and the syn–anti equilibrium were studied by molecular mechanics. The results obtained were quite consistent with those provided by the line-shape
报道了噻吨黄嘌呤核苷8-甲基-6-硫代-7-(β- D-吡喃吡喃糖基)茶碱的合成。三乙酰基衍生物3和4表现出主要分子拥挤和绕糖苷键旋转受限的现象。旋转异构体和稳定顺-反平衡是由分子力学研究。获得的结果与线形方法提供的结果非常一致。