申请人:Sequent Scientific Limited
公开号:US08754215B2
公开(公告)日:2014-06-17
The present disclosure describes a novel, cost-effective process for preparation of a 4-oxo-1,2,3,6,7,11b-hexahydro-4H-pyrazino-[2,1-a]isoquinoline derivatives. Specifically, it discloses a process for the preparation of the anthelmintic drug praziquantel through the use of a novel intermediate, 2-[(2,2-dimethoxyethyl)benzyl amino]-N-phenethylacetamide. This present disclosure also describes a novel crystalline form of 4-oxo-1,2,3,6,7,11b-hexahydro-4H-pyrazino[2,1-a]isoquinoline.
本公开说明书描述了一种新的、成本效益高的4-氧基-1,2,3,6,7,11b-六氢-4H-吡嗪[2,1-a]异喹啉衍生物的制备过程。具体地,它揭示了一种通过使用一种新的中间体2-[(2,2-二甲氧基乙基)苯基氨基]-N-苯乙酰胺制备驱虫药吡喹酮的方法。本公开说明书还描述了一种新的4-氧基-1,2,3,6,7,11b-六氢-4H-吡嗪[2,1-a]异喹啉的晶体形式。