A method for the iridium-catalyzed silylation of aryl C-H bonds is described. The reaction of HSiMe(OSiMe3)(2) with arenes and heteroarenes catalyzed by the combination of [Ir(cod)(OMe)](2) and 2,4,7-trimethylphenanthroline occurs with the aromatic compound as the limiting reagent and with high levels of sterically derived regioselectivity. This new catalytic system occurs with a much higher tolerance for functional groups than the previously reported rhodium-catalyzed silylation of aryl C-H bonds and occurs with a wide range of heteroarenes. The silylarene products are suitable for further transformations, such as oxidation, halogenation, and cross-coupling. Late-stage functionalization of complex pharmaceutical compounds was demonstrated.
Process for the Preparation of Substantially Pure Palonosetron and its Acid Salts
申请人:Chatterjee Sugata
公开号:US20110021778A1
公开(公告)日:2011-01-27
This invention relates to an improved and scalable process for the preparation of substantially pure palonosetron and its acid addition salts, in particular hydrochloride (I) which comprises of,
(a) converting intermediate (IIa) as such or as its freebase (II) to a crude mixture of diastereomeric palonosetrons (VIII) or (VIIIa) contaminated with varying amounts of unconverted intermediate (II) or (IIa) via hydrogenation under pressure with an appropriately chosen hydrogenation catalyst in an suitable organic solvent.
(b) making the resulting crude mixture of diastereomeric palonosetrons (VIII) or (VIIIa) contaminated with varying amounts of unconverted intermediate (II) or (IIa) substantially free from (II) or (IIa) via halogenation reaction.
(c) Finally, converting the resulting diastereomeric palonosetron (VIII) or its hydrochloride (VIIIa) substantially free from intermediate (II) or (IIa) to the desired palonosetron hydrochloride (I) in substantially pure form via selective crystallization from a suitable single or mixture of organic solvents.
[EN] PROCESS FOR THE PREPARATION OF 2-(1-AZABICYCLO(2.2.2)OCT-3-YL) -2,4,5,6-TETRAHYDRO-1H-BENZ(DE)ISOQUINOLIN-1-ONE AND INTERMEDIATE PRODUCT<br/>[FR] PROCEDE DE PREPARATION DE 2-(1-AZABICYCLO[2.2.2.]OCT-3-YL)-2,4,5,6-TETRAHYDRO-1H-BENZ[DE]ISOQUILOEINE-1-ONE ET DE PRODUIT INTERMEDIAIRE
申请人:F. HOFFMANN-LA ROCHE AG
公开号:WO1996001824A1
公开(公告)日:1996-01-25
(EN) The invention relates to novel processes for preparing compounds of formula (2) which process comprises (A) dehydrating the compounds of formula (3), or (B) separating the compound of formula (2) into individual stereoisomers, or (C) converting the compound of formula (2) to a pharmaceutically acceptable acid addition salt, or (D) converting an acid addition salt of the compound of formula (2) into non-salt form, and of compounds of formula (1) which process comprises (A) and (B) dehydrating the compound of formula (3) and hydrogenating this compound to give a diastereomeric mixture of 1, or (C) separating the diastereomeric mixture into individual stereoisomers or mixtures of them, or (D) converting the compound of formula (1) to a pharmaceutically acceptable acid addition salt, or (E) converting an acid addition salt of the compound of formula (1) to non-salt form. The invention relates also to the novel compound of formula (3) and to a process for preparing it. The compounds of formulae (2 and 1) are potent 5-HT3 receptor antagonists and are useful for treating a condition chosen from emesis, a gastrointestinal disorder, anxiety/depressive state, and pain.(FR) L'invention concerne de nouveaux procédés pour préparer des composés de la formule (2) consistant à (A) déshydrater les composés de la formule (3) ou (B) séparer le composé de la formule (2) en deux stéréoisomères individuels ou (C) convertir le composé de la formule (2) en un sel d'addition d'acide acceptable sur le plan pharmaceutique ou (D) convertir un sel d'addition d'acide du composé de la formule (2) en une forme non saline. L'invention concerne également un procédé pour préparer des composés de la formule (1) consistant à (A) et (B) déshydrater le composé de la formule (3) et hydrogéner ce composé pour donner un mélange diastéréoisomère de (1) ou (C) séparer le mélange diastéréoisomère en stéréoisomères individuels ou en mélanges de ceux-ci ou (D) convertir le composé de la formule (1) en un sel d'addition d'acide acceptable sur le plan pharmaceutique ou (E) convertir un sel d'addition d'acide du composé de la formule (1) en une forme non saline. L'invention concerne également le nouveau composé de la formule (3) et un procédé pour le préparer. Les composés des formules (2) et (1) sont de puissants inhibiteurs des récepteurs 5-HT3 et ils sont utiles dans le traitement de vomissements, de troubles gastro-intestinaux, de l'anxiété/dépression et contre la douleur.
NOVEL PALONOSETRON SALTS AND PROCESSES FOR PREPARATION AND PURIFICATION THEREOF
申请人:Wensheng Tang
公开号:US20100174080A1
公开(公告)日:2010-07-08
Provided are novel salts of 2-(1-azabicyclo-[2.2.2]oct-3-yl)-2,3,3a,4,5,6-hexahydro-1H-benz[de]isoquinolin-1-one, methods of using such salts, and processes for producing such salts
[EN] NOVEL CRYSTALLINE FORMS OF PALONOSETRON HYDROCHLORIDE<br/>[FR] NOUVELLES FORMES CRISTALLINES DU CHLORHYDRATE DE PALONOSÉTRON
申请人:NATCO PHARMA LTD
公开号:WO2009087643A1
公开(公告)日:2009-07-16
The present invention relates to novel crystalline forms, designated as Form (I) and Form (II) of Palonosetron Hydrochloride ((3as)-2[(3s)-1-Azabicyclo[2.2.2]Oct-3-yl]-2,3,3a,4,5,6- hexahydro-1H-benz[de]isoquinoline-1-one mono hydrchloride) and processes for their preparation. Palonosetron Hydrochloride is useful as anti-emetic agent during the chemotherapy of treatment of cancer patients. It is marketed globally under the brand names 'Aloxi' and 'Onicit'.