A versatile difluorovinylation method: Cross-coupling reactions of the 2,2-difluorovinylzinc–TMEDA complex with alkenyl, alkynyl, allyl, and benzyl halides
2-difluorovinylzinc–TMEDA complex was prepared via a deprotonation–transmetallation sequence starting from commercially available 1,1-difluoroethylene. The complex thus formed was successfully applied to transition metal-catalyzed cross-coupling reactions with a wide range of organic halides, which led to the syntheses of 2,2-difluorovinyl compounds. On treatment with the difluorovinylzinc–TMEDA complex in the presence
One-Pot Synthesis of 1-Iodoalkynes and Trisubstituted Alkenes from Benzylic and Allylic Bromides
作者:Guillaume Pelletier、Sharon Lie、James J. Mousseau、André B. Charette
DOI:10.1021/ol302544s
日期:2012.11.2
1-Iodoalkynes are formed in moderate to high yields from readily accessible benzylic and allylic alkyl bromides by a one-pot homologation/double elimination procedure with iodoform (CHI3). The developed conditions include facile purification and avoid the use of an excess of triphenylphosphine (PPh3), as described in classical Corey-Fuchs iodoalkynylation conditions. Replacing CHI3 with CHI2CI allows the isolation of the corresponding gem-(2)-chloro-(E)-iodoalkene in good yield and stereoselectivity. Moreover, the use of benzhydryl bromides as nucleophiles enables the synthesis of trisubstituted alkenes under similar reaction conditions.
ALKYL, ALKENYL AND ALKYNYL CHRYSAMINE G DERIVATIVES FOR THE ANTEMORTEM DIAGNOSIS OF ALZHEIMER'S DISEASE AND $i(IN VIVO) IMAGING AND PREVENTION OF AMYLOID DEPOSITION
申请人:UNIVERSITY OF PITTSBURGH
公开号:EP0977815A1
公开(公告)日:2000-02-09
[EN] ALKYL, ALKENYL AND ALKYNYL CHRYSAMINE G DERIVATIVES FOR THE ANTEMORTEM DIAGNOSIS OF ALZHEIMER'S DISEASE AND IN VIVO IMAGING AND PREVENTION OF AMYLOID DEPOSITION<br/>[FR] DERIVES D'ALKYLE, D'ALCENYLE ET D'ALCYNYLE DE LA CHRYSAMINE G DESTINES AU DIAGNOSTIC AVANT LA MORT DE LA MALADIE D'ALZHEIMER, A L'IMAGERIE IN VIVO ET A LA PREVENTION DU DEPOT DE SUBSTANCE AMYLOIDE
申请人:——
公开号:WO1998047969A1
公开(公告)日:1998-10-29
[EN] Amyloid binding compounds which are non-azo derivatives of Chrysamine G, pharmaceutical compositions containing, and methods using such compounds to identify Alzheimer's brain in vivo and to diagnose other pathological conditions characterized by amyloidosis, such as Down's Syndrome are described. Pharmaceutical compositions containing non-azo derivatives of Chrysamine G and methods using such compositions to prevent cell degeneration and amyloid-induced toxicity in amyloidosis associated conditions are also described. Methods using non-azo Chrysamine G derivatives to stain or detect amyloid deposits in biopsy or post-mortem tissue are also described. Methods using non-azo Chrysamine G derivatives to quantify amyloid deposits in homogenates of biopsy and post-mortem tissue are also described. [FR] L'invention concerne des composés se fixant à la substance amyloïde et qui sont des dérivés non azo de la chrysamine G, des compositions pharmaceutiques comprenant ces composés et des procédés les utilisant dans le but d'identifier in vivo, dans un cerveau, la maladie d'Alzheimer et de diagnostiquer d'autres états pathologiques caractérisés par l'amylose tels que le syndrome de Down. Elle concerne également des compositions pharmaceutiques contenant des dérivés non azo de la chrysamine G ainsi que des procédés d'utilisation de ces compositions visant à empêcher la dégénérescence cellulaire et la toxicité induite par la substance amyloïde dans des états associés à l'amylose. Elle concerne en outre des procédés dans lesquels on utilise des dérivés non azo de la chrysamine G afin de marquer ou de détecter des dépôts de substance amyloïde dans un tissu biopsique ou prélevé post mortem. Elle concerne enfin des procédés d'utilisation de dérivés non azo de la chrysamine G afin de quantifier les dépôts de substance amyloïde dans des homogénats de tissu biopsique ou prélevé post mortem.