发明申请
US20120010413A1 Process for the Preparation of Pyrido [2,1-a] Isoquinoline Derivatives by Catalytic Asymmetric Hydrogenation of an Enamine
审中-公开
通过胺的催化不对称氢化制备吡啶并[2,1-a]异喹啉衍生物的方法
- 专利标题: Process for the Preparation of Pyrido [2,1-a] Isoquinoline Derivatives by Catalytic Asymmetric Hydrogenation of an Enamine
- 专利标题(中): 通过胺的催化不对称氢化制备吡啶并[2,1-a]异喹啉衍生物的方法
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申请号: US13235766申请日: 2011-09-19
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公开(公告)号: US20120010413A1公开(公告)日: 2012-01-12
- 发明人: Stefan Abrecht , Michelangelo Scalone , Rudolf Schmid
- 申请人: Stefan Abrecht , Michelangelo Scalone , Rudolf Schmid
- 优先权: EP06120724.7 20060915
- 主分类号: C07D455/08
- IPC分类号: C07D455/08
摘要:
The invention relates to a process for the preparation of pyrido[2,1-a] isoquinoline derivatives of the formula wherein R2, R3 and R4 are as defined in the specification, comprising the steps of a) catalytic asymmetric hydrogenation of an enamine of the formula wherein R1 is lower alkyl, in the presence of a transition metal catalyst containing a chiral diphosphane ligand, b) introduction of an amino protecting group Prot and c) amidation of the ester to form an amide of formula wherein R2, R3, R4 and Prot are as defined in the specification.
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