beta-L-talofuranose 13. Coupling of these sugar derivatives with thymine gave the beta-nucleoside derivatives 18A-E. Treatment of compounds 18A-E with DBU produced the corresponding 2,3'-anhydro nucleosides 19A-E with a free 2'-OH group. After deoxygenation of 2'-O-[[(4-methylphenyl)oxy]thiocarbonyl] compounds 20A-E with tributyltin hydride the 2,3'-anhydro bridge of the 2'-deoxynucleosides 21A-E was opened
从3-O-甲磺酰基-1,2-O-异亚丙基-α-D-
氟呋喃糖(9)开始,将必要的
碳水化合物1,2-二-O-乙酰基-6-O-苯甲酰基-5-脱氧的异头混合物-3-O-甲酰基-D-
呋喃糖酶++ + 17A alpha / beta,1,2-二-O-乙酰基-5,6-二-O-苯甲酰基-3-O-甲酰基-D-
呋喃糖酶17B alpha / beta,合成了1,2-二-O-乙酰基-5,6-二-O-苯甲酰基-3-O-甲磺酰基-L-
呋喃呋喃糖酶17C alpha / beta。从6-脱氧获得1,2-二-O-乙酰基-5-O-苯甲酰基-6-脱氧-3-O-甲磺酰基-D-
呋喃糖酶++ + 17D alpha / beta和相应的L-全
呋喃糖酶17E alpha / beta -3,5-二-O-苯甲酰基-1,2-O-异亚丙基-α-D-
呋喃糖(12)和相应的β-L-talofuranose13。将这些糖衍
生物与胸腺
嘧啶偶联