申请人:Astra Pharmaceutical Production Aktiebolag
公开号:US05034535A1
公开(公告)日:1991-07-23
A process for preparing S-metoprolol of the formula ##STR1## or a salt thereof, with high enantiomeric purity, is described, whereby a (S)-5-hydroxymethyl-3-isopropyloxazolidin-2-one sulfonic acid ester of the formula ##STR2## is prepared, and further reacted with 4-[2-methoxyethyl]phenol of the formula ##STR3## and the resulting intermediate of the formula ##STR4## is hydrolysed to S-metoprolol, and whereby the (S)-5-hydroxymethyl-3-isopropyloxazolidin-2-one sulfonic acid ester of formula II is prepared by reacting (S)-3-isopropylamino-1,2-propanediol of the formula ##STR5## with a chloroformic acid ester of the formula ##STR6## wherein R' is an alkyl group having 1-3 carbon atoms or a phenyl group, to the formation of (S)-5-hydroxymethyl-3-isopropyloxazolidin-2-one of the formula ##STR7## which is reacted with an activated sulfonic acid of the formula ##STR8## wherein R" is an aryl group such as tolyl and X is a halogen such as Cl, to formation of the ester of formula II, which when required is enriched with the (S)-enantiomer by crystallization.
本发明涉及一种制备高对映纯度的S-美托洛尔或其盐的方法,包括以下步骤:首先制备化合物II,其为公式##STR2##中的(S)-5-羟甲基-3-异丙氧唑烷-2-磺酸酯,然后将其与公式##STR3##中的4-[2-甲氧基乙基]苯酚反应,得到中间体的公式##STR4##,接着水解得到S-美托洛尔。其中,化合物II由公式##STR5##中的(S)-3-异丙基氨基-1,2-丙二醇与公式##STR6##中的氯甲酸酯反应制备而成,其中R'为1-3个碳原子的烷基或苯基。化合物II可通过与公式##STR8##中的活化磺酸反应制备得到,其中R"为苯基,如甲苯基,X为卤素,如氯。必要时,化合物II可以通过结晶富集(S)-对映体。