申请人:Honeywell International, Inc.
公开号:US20040110957A1
公开(公告)日:2004-06-10
In a process comprising synthesizing pyranes including [R—(R*,R*)]-N-[3-[1-[5,6-dihydro-4-hydroxy-2-oxo-6-(2-phenylethyl)-6-propyl-2H-pyran-3-yl]propyl]phenyl]-5-(trifluoromethyl)-2-pyridinesulfonamide the present invention comprises the improvements comprising: (a) providing a racemic mixture of 3-hydroxy-3-(2-phenylethyl)-hexanoate ethyl acetate by reacting said 1-phenyl-hexan-3-one with ethylbromoacetate under Reformatsky conditions; and (b) separating (R)-3-hydroxy-3-(2-phenylethyl)-hexanoic acid in enantiomeric excess by saponification and reverse resolution of the racemate of step (a) to produce a resolved product. In addition, the present invention comprises a reverse resolution process for separating an enantiomer from a mixture of enantiomers.
本发明涉及合成吡喃类化合物的方法,包括合成 [R—(R*,R*)]-N-[3-[1-[5,6-二氢-4-羟基-2-氧代-6-(2-苯乙基)-6-丙基-2H-吡喃-3-基]丙基]苯基]-5-(三氟甲基)-2-吡啶磺酰胺的改进。所述改进包括:(a)通过在Reformatsky条件下将1-苯基己酮与溴乙酸乙酯反应,提供3-羟基-3-(2-苯乙基)己酸乙酯的外消旋体混合物;(b)通过皂化和反向分离步骤(a)的外消旋体,分离出(R)-3-羟基-3-(2-苯乙基)己酸,以产生一个分离的产物。此外,本发明还涉及从对映体混合物中分离对映体的反向分离方法。