The present invention relates to a novel process for preparing cis-4-O-protected-substituted-2-cyclopentenol derivatives comprising, a) dissolving a 4-O-protected-2-cyclopentenone in a suitable organic solvent; and b) treating the solution with a suitable Lewis acid and a suitable reducing agent at a temperature of from about -100.degree. C. to about 20.degree. C. The cis-4-O-protected-substituted-2-cyclopentenol derivatives are useful intermediates in the preparation of various cyclopentanyl and cyclopentenyl purine analogs which are useful as immunosuppressants and in the preparation of various prostaglandins.
本发明涉及一种制备顺式-4-O-保护取代-2-
环戊烯醇衍
生物的新方法,包括以下步骤:a) 将4-O-保护的
2-环戊烯酮溶解于适宜的有机溶剂中;b) 在约-100°C至约20°C的温度下,向该溶液中加入适宜的
路易斯酸和适宜的还原剂。顺式-4-O-保护取代-2-
环戊烯醇衍
生物是制备各种环戊基和
环戊烯基
嘌呤类似物的有用中间体,这些类似物可作为
免疫抑制剂,并用于制备各种
前列腺素。