Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
Design and synthesis of novel N-sulfonyl-2-indoles that behave as 5-HT6 receptor ligands with significant selectivity for D3 over D2 receptors
作者:Oscar M. Saavedra、Delphine Karila、Dominique Brossard、Anne Rojas、Delphine Dupuis、Arnaud Gohier、Clotilde Mannoury la Cour、Mark J. Millan、Jean-Claude Ortuno、Stephen Hanessian
DOI:10.1016/j.bmc.2016.10.010
日期:2017.1
antipsychotics display similar affinity for both D2 (D2R) and D3 (D3R) receptors, and they likewise act as 5-HT2A receptor antagonists. They provide therapeutic benefit for positive symptoms, but no marked or consistent improvement in neurocognitive, social cognitive or negative symptoms. Since blockade of D3 and 5-HT6 (5-HT6R) receptors enhances neurocognition and social cognition, and potentially improves
A stereoselective, tandem [2+2] photocycloaddition–hydrolysis route to aldol-type adducts
作者:Manabu Abe、Masayuki Ikeda、Masatomo Nojima
DOI:10.1039/a805404e
日期:——
Photocycloadditions of aromatic aldehydes 2aâe with cyclic ketene silyl acetals 1aâe have been investigated. Regio- and exo-selective formation of the bicyclic 2-alkoxyoxetanes 3 was observed in high yields. Hydrolysis of the acid-labile oxetanes 3 with neutral water was efficiently achieved to give aldol-type adducts 4 (threo-selective formations).
C-C Coupling of Acyclic Nitronates with Silyl Ketene Acetals under Silyl Triflate Catalysis: Reactivity Umpolung of Aliphatic Nitro Compounds
作者:Vladimir O. Smirnov、Yulia A. Khomutova、Vladimir A. Tartakovsky、Sema L. Ioffe
DOI:10.1002/ejoc.201200239
日期:2012.6
C–C coupling of alkyl and trialkylsilyl nitronates with silyl keteneacetals yields functionalized nitroso acetals. This conversion may serve as a new simple procedure to reverse the conventional reactivity of aliphatic nitro compounds. Preliminary results on the hydrogenation of nitroso acetals into amino acids derivatives, as well as TFA-catalyzed transformations of nitroso acetals, are examined to
Functionalized Triarylcarbenium Ions as Catalysts in Mukaiyama Aldol Addition: Effects of Counter Ions and Silyl Groups on the Intervention of Silyl Catalysis
作者:Chien-Tien Chen、Shi-Deh Chao、Kuao-Chung Yen
DOI:10.1055/s-1998-1815
日期:1998.8
Stereochemical studies have indicated that functionalized Tr+SbCl6 - may serve as efficient aldol reaction catalysts by judicious choice of a silyl component. The aldol addition between TMS ketene acetal derived from γ-butyrolactone and benzaldehyde provided the silyl aldolates with high syn diastereoselectivities.