[EN] PROCESS FOR PREPARING OBETICHOLIC ACID<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACIDE OBÉTICHOLIQUE
申请人:FARMAK A S
公开号:WO2020119836A1
公开(公告)日:2020-06-18
A process for preparing obeticholic acid, wherein the 7-keto-litocholic acid amide of formula (II), where R1, R2 are a C1-C6 n-alkyl, or together a C5-C6 cycle and the protecting group on the hydroxyl in position 3 is a carbamoyl with the same substitution as the amide, is converted to the 7-trimethylsilyl enol ether of formula (III), which is then converted by reaction with an alkylation agent to the 6-ethylidene-derivative of formula (IV), which is hydrogenated to the compound of formula (V) and then simultaneously deprotected in position 3 and hydrolysed to the compound of formula (VI) and then reduced to obeticholic acid of formula (VII).