Under catalyst-free conditions, an efficient method to synthesize 2-pyridinylamides has been developed, and the protocol uses inexpensive and readily available 2-fluoropyridine and amidine derivatives as the starting materials. Simultaneously, the copper-catalysed approach to imidazopyridine derivatives has been established with high chemoselectivity and regiospecificity. The results suggest that the
Convergent Syntheses of<i>N</i>-Boc-Protected (2<i>S</i>,4<i>R</i>)-4-(<i>Z</i>)-Propenylproline and 5-Chloro-1-(methoxymethoxy)pyrrol-2-carboxylic Acid − Two Essential Building Blocks for the Signal Metabolite Hormaomycin
作者:Boris D. Zlatopolskiy、Hans-Peter Kroll、Elisa Melotto、Armin de Meijere
DOI:10.1002/ejoc.200400480
日期:2004.11
conventional Wittig reaction to construct the double bond has been developed [11% yield over 8 steps from N-Boc-protected (2S,4R)-4-hydroxyproline, 7]. The O-MOM-protected 5-chloro-1-hydroxypyrrole-2-carboxylic acid [Chpca(MOM)-OH (29)] was prepared along a reasonably efficient synthetic route applying the thermal rearrangement of 2-azido-6-chloropyridine N-oxide (22) as a key step in fairly good overall
[EN] PROCESS FOR THE SYNTHESIS OF DIAMINOPYRIDINE AND RELATED COMPOUNDS<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE DIAMINOPYRIDINE ET DE COMPOSÉS APPARENTÉS
申请人:DU PONT
公开号:WO2009018504A1
公开(公告)日:2009-02-05
A process is provided for the synthesis of a diaminopyridine, such as 2,6-diaminopyridine and related compounds, which are used industrially as compounds and as components in the synthesis of a variety of useful materials. The synthesis proceeds by means of a chlorine-ammonia displacement in the presence of a copper source.
A safe and efficient synthesis of 6-chloro-5-methylpyridin-2-amine, a keyintermediate for lumacaftor, is described, which avoids the utilization of peroxide. In this four-step sequence, starting from 2-amino-6-chloropyridine, the crucial 5-position methylation was achieved via a Suzuki-Miyaura cross-coupling reaction. By adopting this synthetic route, 6-chloro-5-methylpyridin-2-amine was produced
4,5-DIHYDRO-1H-PYRAZOLE COMPOUNDS AND THEIR PHARMACEUTICAL USES
申请人:Arhancet Graciela Barbieri
公开号:US20120022058A1
公开(公告)日:2012-01-26
Mineralocorticoid receptor antagonists (MRa), pharmaceutical compositions containing such inhibitors and the use of such inhibitors to treat, for example, diabetic nephropathy and hypertension in mammals, including humans.