Homologation of Isocyanates with Lithium Carbenoids: A Straightforward Access to α-Halomethyl- and α,α-Dihalomethylamides
摘要:
Treatment of widely available isocyanates with monohalolithium and dihalolithium carbenoids provides a valuable protocol for the one-pot preparation of -halo- and ,-dihaloacetamide derivatives. While monohalolithium carbenoids can be prepared by a smooth lithium-halogen exchange, the preparation of the corresponding dihalo compounds proved to be highly dependent on the base used to realize the deprotonation, with lithium 2,2,6,6-tetramethylpiperidine emerging as optimal. The clear advantages of the procedure are: (a) broad scope of isocyanates that can be employed; (b) preservation of the optical purity when chiral materials are used; (c) divergent access to different haloamides by simply selecting the homologating agents. We also report an application of Charette's imidoyl triflate activation of a secondary amide to the synthesis of an -chloro ketone and N-15 NMR data for selected compounds.
Synthesis of Rigid Receptors Based on Triphenylene Ketals
作者:Matthias C. Schopohl、Andreas Faust、Daniela Mirk、Roland Fröhlich、Olga Kataeva、Siegfried R. Waldvogel
DOI:10.1002/ejoc.200500108
日期:2005.7
The synthesis of rigid receptors based on triphenylene ketals, including some improved procedures, is described in detail. Since chemical transformations are strongly influenced by the rigid character and steric bulkiness of the receptors, the construction of a subunit allowing quicker synthetic development is also reported. The preparation of these receptor structures involves an oxidative trimerization
[EN] NOVEL 4-(AZACYCLOALKYL)BENZENE-1,3-DIOL COMPOUNDS AS TYROSINASE INHIBITORS, PROCESS FOR THE PREPARATION THEREOF AND USE THEREOF IN HUMAN MEDICINE AND IN COSMETICS<br/>[FR] NOUVEAUX COMPOSÉS DE 4- (AZACYCLOALKYL) BENZENE-1, 3-DIOL UTILISÉS COMME INHIBITEURS DE LA TYROSINASE, LEUR PROCÉDÉ DE PRÉPARATION ET LEUR UTILISATION EN MÉDICINE HUMAINE ET DANS LES COSMÉTIQUES
申请人:GALDERMA RES & DEV
公开号:WO2010063774A1
公开(公告)日:2010-06-10
The present invention relates to novel 4- (azacycloalkyl) benzene-1, 3-diol compounds corresponding to general formula (I) below: Formula (I) to the compositions containing same, to the process for the preparation thereof and to the use thereof in pharmaceutical or cosmetic compositions for use in the treatment or prevention of pigmentary disorders.
[EN] TRPM8 ANTAGONISTS AND THEIR USE IN TREATMENTS<br/>[FR] ANTAGONISTES DE TRPM8 ET LEUR UTILISATION DANS LE CADRE THÉRAPEUTIQUE
申请人:AMGEN INC
公开号:WO2012177896A1
公开(公告)日:2012-12-27
Compounds of Formula (I) are useful as antagonists of TRPM8. Such compounds are useful in treating a number of TRPM8 mediated disorders and conditions and may be used to prepare medicaments and pharmaceutical compositions useful for treating such disorders and conditions. Examples of such disorders include, but are not limited to, migraines and neuropathic pain. Compounds of Formula (I) have the above structure, where the definitions of the variables are provided herein.
IMIDAZOLIDINE CARBOXAMIDE DERIVATIVES AS LIPASE AND PHOSPHOLIPASE INHIBITORS
申请人:ZOLLER Gerhard
公开号:US20100105719A1
公开(公告)日:2010-04-29
The present invention relates to imidazolidinecarboxamide derivatives of the general formula I,
wherein R, R1, R2, X and Y are as defined herein, or pharmaceutically usable salts thereof and the use thereof as medicinal substances.
AZOLOPYRIDIN-3-ONE DERIVATIVES AS INHIBITORS OF LIPASES AND PHOSPHOLIPASES
申请人:Zoller Gerhard
公开号:US20090054478A1
公开(公告)日:2009-02-26
The present invention relates to azolopyridin-3-one derivatives of the general formula I with the meanings indicated in the description, their pharmaceutically usable salts and their use as medicinal substances.