Novel naphthyridines are histamine H3 antagonists and serotonin reuptake transporter inhibitors
摘要:
A series of novel tetrahydronaphthyridine-based histamine H-3 ligands that have serotonin reuptake transporter inhibitor activity is described. The 1,2,3,4-tetrahydro-2,6-naphthyridine scaffold is assembled via the addition of a nitrostyrene to a metalated pyridine followed by reduction and cyclization to form the naphthyridine. In vitro biological data for these novel compounds are discussed. (c) 2007 Elsevier Ltd. All rights reserved.
Cyanomethyl anion transfer reagents for diastereoselective Corey–Chaykovsky cyclopropanation reactions
作者:Renè Hommelsheim、Katharina J. Hock、Christian Schumacher、Mohanad A. Hussein、Thanh V. Nguyen、Rene M. Koenigs
DOI:10.1039/c8cc05602a
日期:——
A readily available and bench-stable cyanomethyl sulfonium salt was used in highly diastereoselective Corey–Chaykovsky cyclopropanationreactions of electron-poor olefins. This efficient method provides a rapid route to access densely functionalized cyclopropyl nitriles.
acid/base-free domino process is developed for the regioselective synthesis of 1,2,4-trisubstituted pyrroles. The process involves 1,3-dipolar cycloaddition of unsymmetrical azomethine ylide resulting from the thermal C–C bond cleavage of unactivated aziridines with β-bromo-β-nitrostyrene, followed by a cascade of elimination and aromatization reaction sequence to preferentially furnish 1,2,4-trisubstituted
Sugar thiourea catalyzed highly enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinone to β-nitroalkenes
作者:B. V. Subba Reddy、S. Madhusudana Reddy、Manisha Swain
DOI:10.1039/c2ra22270a
日期:——
A highly enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinone to β-nitrostyrenes has been achieved using a novel class of sugar-Cinchona thiourea conjugates. The method offers significant advantages such as low catalyst loading (1 mol%), high enantioselectivity (up to 99% ee), short reaction times and ambient reaction conditions.
The present invention relates to compounds of formula
wherein
A-B is —CH
2
—CH
2
—, —CH
2
—O— or —O—CH
2
—; X is hydrogen or hydroxy;
R
1
is aryl, optionally substituted by one or two substituents selected from the group consisting of halogen, lower alkyl, cyano, CF
3
, —OCF
3
, lower alkoxy, —SO
2
-lower alkyl and heteroaryl;
R
2
is aryl, optionally substituted by one or two substituents selected from the group consisting of halogen, lower alkyl, CF
3
, and lower alkoxy;
R
3
is hydrogen or lower alkyl;
n is
0, 1
or
2;
or a pharmaceutically active salt thereof. The compounds of the invention may be used in the treatment of neurological and neuropsychiatric disorders.
Aminochlorination reaction with N-chlorophthalimide as a new nitrogen/chlorine source resulting in α-amino derivatives
作者:Yu Qian、Xiaoyun Ji、Wei Zhou、Jianlin Han、Guigen Li、Yi Pan
DOI:10.1016/j.tet.2012.05.066
日期:2012.8
N-chlorophthalimide was reported as an efficient nitrogen/chlorine source for the aminohalogenation of β-nitrostyrenes, which tolerates a wide range of β-nitrostyrenes substrates with good chemical yields, as well as excellent regioselectivities. The resulted vicinal haloamino nitro products have been converted into several other valuable α-amino compounds under simple and mild conditions.