The present invention relates to a process for the preparation of a chiral prostaglandin enol intermediate of formula 1, comprising the steps of: separating a compound of formula 16-(R,S)-10 into its diastereomers by fractional crystallisation, reducing the 15-oxo group of the compound of formula 16-(R)-10, thereby obtaining a compound of formula 15-(R,S),16-(R)-11, followed by removing the protecting group of the compound of formula 15-(R,S),16-(R)-11, and isolating the compound of formula 1, and optionally, crystallizing the compound of formula 1. Optionally, the undesired isomer formed during fractional crystallization can be epimerized and further amount of the desired isomer can be recovered from the resulting mixture. The present invention also provides novel intermediates useful in the process. The invention further relates to a process for fractional crystallization of the compound of formula 16-(R,S)-10.
本发明涉及一种制备手性
前列腺素烯醇中间体的方法,其
化学式为1,包括以下步骤:通过分级结晶将化合物16-(R,S)-10分离成其不对映异构体,还原化合物16-(R)-10的15-氧基团,从而获得化合物15-(R,S),16-(R)-11,随后去除化合物15-(R,S),16-(R)-11的保护基,并分离化合物1,并可选择性地结晶化合物1。可选地,在分级结晶过程中形成的不需要的异构体可进行外消旋作用,从所得混合物中进一步回收所需异构体的量。本发明还提供了在该过程中有用的新型中间体。此外,本发明还涉及一种用于化合物16-(R,S)-10的分级结晶的方法。