substituted benzimidazolesfrom 1,1-dibromoethenes and o-diaminobenzenes is described. The reaction employs DABCO as the base and NMP as the solvent. A variety of substitutions on both 2-aryl-1,1-dibromoethenes and o-diaminobenzenes are tolerated. This new procedure is carried out under mildly basic conditions, which may provide a complementary route to the existing preparations of benzimidazoles.
Method For Enantioselective Preparation Of Sulphoxide Derivatives
申请人:Cohen Avraham
公开号:US20070299261A1
公开(公告)日:2007-12-27
The present invention concerns enantioselective preparation of sulphoxide derivatives or their salts. The method consist in performing an enantioselective oxidation of a sulphur of general formula (I) A-CH
2
—SB, wherein: A is a diversely substituted pyridinyl ring and B is a heterocyclic radical comprising an imidazo-pyridinyl ring, using an oxidizing agent in the presence of a titanium
(IV)
-based catalyst and a chiral ligand consisting of a cyclic beta or gamma-amino-alcohol, in an organic solvent, followed, if required, by salt formation with a base. The invention is useful for preparing sulphoxides useful in therapeutics.
An Advantageous Synthesis of 2-Substituted Benzimidazoles Using Polyphosphoric Acid. 2-(Pyridyl)-1<i>H</i>-benzimidazoles, 1-Alkyl-(1<i>H</i>-benzimidazol-2-yl)pyridinium Salts, their Homologues and Vinylogues
The title 2-substituted benzimidazoles are prepared by a highly efficient one-pot procedure, cyclodehydration of the corresponding accessible carboxylic acids and 1,2-arylenediamines, using polyphosphoric acid as the catalyst and solvent in a condensation of the type found in the Phillips benzimidazole synthesis. The method has been adapted and proved to be extremely useful for 1-alkyl-(1H-benzimidazol-2-yl) pyridinium tetrafluoroborates with a methylene and vinylene interannular moiety.
[EN] A PROCESS FOR PREPARING PYRIDINYLMETHYL-1H- BENZIMIDAZOLE COMPOUNDS IN ENANTIOMERICALLY ENRICHED FORM OR AS SINGLE ENANTIOMERS<br/>[FR] METHODE SERVANT A PREPARER DES COMPOSES DE PYRIDINYLMETHYL-1H-BENZIMIDAZOLE SOUS FORME D'ENANTIOMERES SIMPLES OU ENRICHIS
申请人:HETERO DRUGS LTD
公开号:WO2005105786A1
公开(公告)日:2005-11-10
The present invention relates to a process for preparing substituted sulfoxides either as a single enantiomer or in an enantiomerically enriched form. Thus, racemic omeprazole is reacted with (S)-camphorsulfonyl chloride to form a diastereomeric mixture and the diastereomers are separated by fractional crystallization, followed by deprotection to give esomeprazole.
IMIDAZOLE DERIVATIVES HAVING ARYL PIPERIDINE SUBSTITUENT, METHOD FOR PREPARATION THEREOF AND PHARMACEUTICAL COMPOSITIONS CONTAINING SAME
申请人:Suh Jee Hee
公开号:US20100145054A1
公开(公告)日:2010-06-10
The present invention is directed to a novel imidazole derivative having an aryl piperidine substituent of formula (I) and a method for preparation thereof, and a pharmaceutical composition containing said imidazole derivative as an active ingredient for preventing or treating a MCH (melanine-concentrating hormone)-related disease.