Invention Grant
- Patent Title: Kinetic resolution of racemic hydroxy ester via asymmetric catalytic hydrogenation and application thereof
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Application No.: US15526763Application Date: 2015-08-08
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Publication No.: US10676422B2Publication Date: 2020-06-09
- Inventor: Qilin Zhou , Jianhua Xie , Xiaohui Yang , Lixin Wang
- Applicant: Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Applicant Address: CN Taizhou, Zhejiang
- Assignee: ZHEJIANG JIUZHOU PHARMACEUTICAL CO., LTD.
- Current Assignee: ZHEJIANG JIUZHOU PHARMACEUTICAL CO., LTD.
- Current Assignee Address: CN Taizhou, Zhejiang
- Agency: Liang Legal Group, PLLC
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@34bdafac
- International Application: PCT/CN2015/086425 WO 20150808
- International Announcement: WO2016/082583 WO 20160602
- Main IPC: C07C69/675
- IPC: C07C69/675 ; C07C29/149 ; C07C31/20 ; C07C67/48 ; B01J31/18 ; B01J31/24 ; C07B53/00 ; C07B57/00 ; C07D211/02 ; C07D211/12 ; C07D305/06 ; C07D309/06 ; C07D473/06 ; C07D309/30 ; C07C69/732 ; C07C69/708 ; C07C33/26

Abstract:
The present invention relates to kinetic resolution of racemic δ-hydroxyl ester via asymmetric catalytic hydrogenation and an application thereof. In the presence of chiral spiro pyridyl phosphine ligand Iridium catalyst and base, racemic δ-hydroxyl esters were subjected to asymmetric catalytic hydrogenation to obtain extent optical purity chiral δ-hydroxyl esters and corresponding 1,5-diols. An optically active chiral δ-hydroxyl ester and 1,5-diols can be obtained at very high enantioselectivity and yield with relatively low usage of catalyst. The chiral δ-hydroxyl ester and 1,5-diols obtained by using the method can be used as a critical raw material for asymmetric synthesis of chiral drugs (R)-lisofylline and natural drugs (+)-civet, (−)-indolizidine 167B and (−)-coniine.
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