[EN] AN IMPROVED PROCESS FOR - THE PREPARATION OF DEXMETHYLPHENIDATE HYDROCHLORIDE. [FR] PROCÉDÉ PERFECTIONNÉ POUR LA PRÉPARATION DE CHLORHYDRATE DE DEXMÉTHYLPHÉNIDATE
[EN] PRODRUGS OF SECONDARY AMINE COMPOUNDS<br/>[FR] PROMÉDICAMENTS DE COMPOSÉS AMINE SECONDAIRES
申请人:ALKERMES PHARMA IRELAND LTD
公开号:WO2013088255A1
公开(公告)日:2013-06-20
The present invention relates to compounds of Formula (I).
本发明涉及式(I)的化合物。
Synthesis of Methylphenidate and Analogs Thereof
申请人:Haar, JR. Joseph P.
公开号:US20100179327A1
公开(公告)日:2010-07-15
A synthetic process for the preparation of amino acid esters such as methylphenidate and analogs thereof is disclosed. The process involves reacting an amino acid such as α-phenyl-α-(2-piperidinyl)acetic acid or an analog thereof with an alcohol such as methanol in the presence of an acid and a water sequestrant such as trimethyl orthoacetate. In some embodiments, the water sequestrant is added to the reaction mixture after an initial period of esterification and then the reaction is allowed to continue. The α-phenyl-α-(2-piperidinyl)acetic acid methyl ester or analog thereof is then isolated from the reaction mixture. In one variation of the process, the supernatant liquid may be recycled in subsequent runs to increase yield and product purity.
A method to resolve the stereoisomers of an optically active compound comprising an amine moiety. The method provides a mixture comprising two stereoisomers of a compound comprising a amine moiety. The method supplies l-fenchyloxyacetic acid, treats the mixture of stereoisomers with that l-fenchyloxyacetic acid, and collects one of those two stereoisomers having greater than a 99 percent enantiomeric excess.
Process for the preparation of threo-methylphenidate hydrochloride
申请人:ISP INVESTMENTS INC.
公开号:US20040176412A1
公开(公告)日:2004-09-09
The present invention provides a process for the preparation of threo-methylphenidate hydrochloride. According to a preferred embodiment, the process comprises the following steps:
(a) contacting 1-(phenylglyoxylyl)piperidine arenesulfonylhydrazone of the formula
1
wherein Ar denotes an aryl group, where the aryl group may be substituted by a C
1
-C
6
alkyl, halo or nitro group;
with an inorganic base in the presence of a water immiscible organic solvent and a phase transfer catalyst to obtain (R*,R*)-enriched 7-phenyl-1-azabicyclo[4.2.0]octan-8-one of the formula:
2
(b) reacting the (R*,R*)-enriched 7-phenyl-1-azabicyclo[4.2.0]octan-8-one prepared in step (a) with a solution of hydrogen chloride in methanol to obtain threo-enriched methylphenidate hydrochloride;
(c) crystallizing the threo-enriched methylphenidate hydrochloride prepared in step (b) to give the desired threo-methylphenidate hydrochloride. Preferably, the threo-methylphenidate hydrochloride produced by the process of the present invention contains no more than 1% of the erythro-isomer.
Synthesis and Pharmacology of Potential Cocaine Antagonists. 2. Structure−Activity Relationship Studies of Aromatic Ring-Substituted Methylphenidate Analogs
作者:Howard M. Deutsch、Qing Shi、Ewa Gruszecka-Kowalik、Margaret M. Schweri
DOI:10.1021/jm950697c
日期:1996.3.15
can block the binding of cocaine to the dopamine transporter, yet spare dopamine uptake, a series of aromatic ring-substituted methylphenidate derivatives was synthesized and tested for inhibitory potency in [3H]WIN 35,428 binding and [3H]dopamine uptake assays using rat striatal tissue. Synthesis was accomplished by alkylation of 2-bromopyridine with anions derived from various substituted phenylacetonitriles