β-肾上腺素能受体阻断剂是一类重要的药物分子。本研究报告了 ( RS )-、( R )- 和 ( S )-布诺洛尔(一种有效的 β-肾上腺素受体阻滞剂)的新化学和化学酶合成工艺。在化学酶法中,利用CAL L4777脂肪酶进行对映选择性动力学拆分,从相应的外消旋醇合成对映体纯( R )-醇和( S )-酯。此后,将相应的( R )-醇和脱酰基化的( S )-酯用叔丁胺处理,分别产生( S )-和( R )-布布洛尔。化学方法中,以环氧氯丙烷( RS- 、 R- 、 S- )为起始原料,分别以( RS )-、( S )-、( R )-缩水甘油醚为中间体,合成对映体( RS ) -、( R )-和( S )-布洛尔。比较两种方法,发现化学酶法更有效,对映体过量达 98%,产率 35%。
Enantioselective process for the preparation of leveobunolol
申请人:Medicham, S.A.
公开号:US05426227A1
公开(公告)日:1995-06-20
The invention relates to a new, industrially advantageous, process for the preparation of the known beta-adrenergic blocking agent, levobunolol, not requiring resolution of racemic bunolol, based on the enantioselective synthesis of an oxiranic intermediate which is then reacted with tert-butylamine. It consists of reacting 5-hydroxy-3,4-dihydro-1(2H)-naphthalenone with (R)-(-)epichlorhydrine in an aprotic solvent, in the presence of a strong base at a temperature of over 90.degree. C., thus obtaining the intermediate chiral oxirane (S)-5-(2,3-epoxypropoxy)-3,4-dihydro-1-(2H)-naphthalenone with more than 95% optical purity, and then, the intermediate chiral oxirane is reacted with tert-butylamine.
and chemo-enzymatic synthetic process for (RS)-, (R)-, and (S)-bunolol, one of the potent β-adrenergic receptor blocker. In chemo-enzymatic process, CAL L4777 lipase was employed for enantioselective kinetic resolution to synthesize the enantiopure (R)-alcohol and (S)-ester from the corresponding racemic alcohol. Thereafter, the corresponding (R)-alcohol and deacylated (S)-ester were treated with tert-butylamine
β-肾上腺素能受体阻断剂是一类重要的药物分子。本研究报告了 ( RS )-、( R )- 和 ( S )-布诺洛尔(一种有效的 β-肾上腺素受体阻滞剂)的新化学和化学酶合成工艺。在化学酶法中,利用CAL L4777脂肪酶进行对映选择性动力学拆分,从相应的外消旋醇合成对映体纯( R )-醇和( S )-酯。此后,将相应的( R )-醇和脱酰基化的( S )-酯用叔丁胺处理,分别产生( S )-和( R )-布布洛尔。化学方法中,以环氧氯丙烷( RS- 、 R- 、 S- )为起始原料,分别以( RS )-、( S )-、( R )-缩水甘油醚为中间体,合成对映体( RS ) -、( R )-和( S )-布洛尔。比较两种方法,发现化学酶法更有效,对映体过量达 98%,产率 35%。