3′-Deoxyformycin was prepared by transformation of the formycin A with 2-acetoxyisobutyryl bromide. Both formycin A and its 3′-deoxy analogue were converted into their 5′-chloro-5′-deoxy derivatives with thionyl chloride. Finally 5′-chloro-5′-deoxy formycin A and 5′-chloro-3′,5′ dideoxyformycin A were condensed with L-homocysteine sodium salt to give S-formycinyl-L-homocysteine and S-3′-deoxyformycinyl-L-homocysteine in good yields.
3′-去氧福尔米辛是通过将福尔米辛A与2-
乙酸氧异
丁酰溴化物反应制备的。福尔米辛A及其3′-去氧类似物均与
氯化亚
硫酰转化为各自的5′-
氯-5′-去氧衍
生物。最后,5′-
氯-5′-去氧福尔米辛A和5′-
氯-3′,5′-二去氧福尔米辛A与L-同型半胱
氨酸钠盐缩合,良好收率地得到S-福尔米辛基-L-同型半胱
氨酸和S-3′-去氧福尔米辛基-L-同型半胱
氨酸。