A process for preparing a batch of highly purified, pharmaceutical grade tasimelteon comprises analyzing a batch of tasimelteon synthesized under GMP conditions for the presence of one or more identified impurities.
Ruthenium(II) catalysts for use in stereoselective cyclopropanations
申请人:Pereira David E.
公开号:US20070270593A1
公开(公告)日:2007-11-22
Chiral ruthenium catalysts comprising salen and alkenyl ligands are provided for stereoselective cyclopropanation, and methods of cyclopropanation are provided. The chiral ruthenium catalyst is prepared in situ by combining an alkenyl ligand, a deprotonated chiral salen ligand, and a ruthenium (II) metal. A preferred catalyst is prepared in situ by combining 2,3-dihydro-4-venylbenzofuran, deprotonated 1,2-cyclohexanediamino-N,N′-bis(3,5-di-t-butyl-salicylidene) and RuCl
2
(p-cymene)]
2
.
SYNTHESIS OF 1-(2,3-DIHYDROBENZOFURAN-4-YL)ETHANONE AS INTERMEDIATE IN THE PREPARATION OF RAMELTEON
申请人:CLuzeau Jerome
公开号:US20120083526A1
公开(公告)日:2012-04-05
The present invention relates in general to the field of organic chemistry and in particular to the preparation of 1-(2,3-dihydrobenzofuran-4-yl)ethanone, an intermediate in preparation of (S)—N-[2-(1,6,7,8-tetrahydro-2H-indeno-[5,4-b]furan-8-yl)ethyl]propionamide, i.e. ramelteon.
Synthesis of 1-(2,3-Dihydrobenzofuran-4-YL)ethanone as intermediate in the preparation of ramelteon
申请人:LEK Pharmaceuticals d.d.
公开号:EP2243775A1
公开(公告)日:2010-10-27
The present invention relates in general to the field of organic chemistry and in particular to the preparation of 1-(2,3-dihydrobenzofuran-4-yl)ethanone, an intermediate in preparation of (S)-N-[2-(1,6,7,8-tetrahydro-2H-indeno-[5,4-b]furan-8-yl)ethyl]propionamide, i.e. ramelteon.
A process for preparing a batch of highly purified, pharmaceutical grade tasimelteon comprises analyzing a batch of tasimelteon synthesized under GMP conditions for the presence of one or more identified impurities.