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。