Enantioselective enzymatic aminolysis of a racemic 2-isoxazolylacetate alkyl ester
申请人:——
公开号:US20020160465A1
公开(公告)日:2002-10-31
The present invention relates to a process for the enantioselective enzymatic aminolysis of racemic 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetate ((R/S)-I) by methyl N
&agr;
-Boc-L-&agr;,&bgr;-diaminoproprionate .p-toluenesulfonic acid. More specifically, this invention pertains to a process for the enantioselective enzymatic aminolysis of racemic isobutyl 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]-acetate by methyl N
&agr;
-Boc-L-&agr;,&bgr;-diaminoproprionate .p-toluene sulfonic acid to produce (R)-methyl-3-[[[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetyl]amino]-N-(butoxycarbonyl)-L-alanine, an intermediate in the preparation of roxifiban, an isoxazoline-based platelet glycoprotein IIb/IIIa antagonist which has activity as an antithrombotic agent.
本发明涉及一种外消旋 2-[3-(4-氰基苯基)-4,5-二氢-5-异恶唑基]乙酸酯((R/S)-I)的对映体选择性酶法氨解工艺。
&agr;
-Boc-L-&agr;,&bgr;-二氨基丙酸 .对甲苯磺酸。更具体地说,本发明涉及一种外消旋 2-[3-(4-氰基苯基)-4,5-二氢-5-异恶唑基]-乙酸异丁酯与 N&agr;-Boc-L-&agr;,&bgr;-二氨基丙酸甲酯的对映体选择性酶法氨解工艺。
&agr;
-N-叔丁氧羰基-L-&agr;,&bgr;-二氨基丙酸甲酯。对甲苯磺酸生成(R)-甲基-3-[[[3-(4-氰基苯基)-4,5-二氢-5-异恶唑基]乙酰基]氨基]-N-(丁氧羰基)-L-丙氨酸是制备罗昔非班的中间体,罗昔非班是一种基于异噁唑啉的血小板糖蛋白 IIb/IIIa 拮抗剂,具有抗血栓药物的活性。