A class of substituted azetidine, pyrrolidine and piperidine derivatives are selective agonists of 5-HT.sub.1 -like receptors, being potent agonists of the human 5-HT.sub.1D.alpha. receptor subtype whilst possessing at least a 10-fold selective affinity for the 5-HT.sub.1D.alpha. receptor subtype relative to the 5-HT.sub.1D.beta. subtype; they are therefore useful in the treatment and/or prevention of clinical conditions, in particular migraine and associated disorders, for which a subtype-selective agonist of 5-HT.sub.1D receptors is indicated, whilst eliciting fewer side-effects, notably adverse cardiovascular events, than those associated with non-subtype-selective 5-HT.sub.1D receptor agonists.
An Efficient Synthesis of the Indole Acetic Acid Metabolite of MK-0462
作者:Cheng-yi Chen、David R. Lieberman、Leslie J. Street、Alex R. Guiblin、Robert D. Larsen、Thomas R. Verhoeven
DOI:10.1080/00397919608003552
日期:1996.5
Abstract A palladium-catalyzed coupling of iodoaniline 2 with bis-TES propargyl alcohol 3 gives indole-3-methanol 4b in 72% yield. Displacement of the hydroxy group of 4b by sodium cyanide followed by hydrolysis of the cyano group and desilylation provides the indole acetic acid metabolite, L-749,335 (1), of the 5-HT1DreceptoragonistMK-0462.
In this study, a novel and convenient route for the construction of 5-((1H-1,2,4-triazol-1-yl)methyl)-1H-indoles (8) is presented starting from (1H-1,2,4-triazol-1-yl)methanol (5) and indolines (6) under 98% H2SO4 at room temperature for 4-24 h, followed by deacetylation and dehydrogenation. Based on this finding, a novel route to synthesize Rizatriptan starting from tryptamine was designed and accomplished with 48.5% overall yield in 6 steps. Compared with operational art, the new route afforded higher yield and more pure products requiring no chromatographic purification, which may further be applied in industrialization. (C) 2014 Elsevier Ltd. All rights reserved.
Syntheses of Indoles <i>via</i> a Palladium-Catalyzed Annulation between Iodoanilines and Ketones
作者:Cheng-yi Chen、David R. Lieberman、Robert D. Larsen、Thomas R. Verhoeven、Paul J. Reider
DOI:10.1021/jo970278i
日期:1997.5.1
INDOLE SYNTHESIS BY Pd-CATALYZED ANNULATION OF KETONES WITH o-IODOANILINE: 1,2,3,4-TETRAHYDROCARBAZOLE
作者:Chen, Cheng-yi、Larsen, Robert D.、Charnley, Adam、Wolff, Steven