- Highly selective acylation of polyamines and aminoglycosides by 5-acyl-5-phenyl-1,5-dihydro-4: H -pyrazol-4-ones
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5-Acyl-5-phenyl-1,5-dihydro-4H-pyrazol-4-ones, accessible from arylpropargyl phenyldiazoacetates, are highly selective acyl transfer reagents for di- and polyamines, as well as aminoalcohols and aminothiols. As reagents with a carbon-based leaving group, they have been applied for benzoyl transfer with a broad selection of substrates containing aliphatic amino in combination with other competing nucleophilic functional groups. The substrate scope and levels of selectivity for direct benzoyl transfer exceed those of known benzoylating reagents. With exceptional selectivity for acylation between primary amines bound to primary and secondary carbons, these new reagents have been used in direct site-selective monobenzoylation of aminoglycoside antibiotics.
- Marichev, Kostiantyn O.,Garcia, Estevan C.,Bhowmick, Kartick C.,Wherritt, Daniel J.,Arman, Hadi,Doyle, Michael P.
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p. 7152 - 7159
(2017/10/05)
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- Microwave-Promoted Transformations: Fast and Chemoselective N-Acylation of Amino Alcohols Using Catalytic Amounts of Dibutyltin Oxide. Influence of the Power Output and the Nature of the Acylating Agent on the Selectivity
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The influence of the nature of the acylating agent and the power output on the chemoselectivity of the microwave-mediated acylation of 1,2- and 1,3-amino alcohols catalyzed by dibutyltin oxide has been studied.The method constitutes an efficient procedure for the selective N-acylation of amino alcohols.
- Morcuende, Anabel,Ors, Marta,Valverde, Serafin,Herradon, Berbardo
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p. 5264 - 5270
(2007/10/03)
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- Imidazole 5-position substituted angiotensin II antagonists
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Novel substituted imidazoles of Formula (III), which are useful as angiotensin-II antagonists, are disclosed: STR1 These compounds, exemplified by the compound 1-((2'-((i-Amyloxycarbonylamino)sulfonyl)-3-fluoro-(1,1'-biphenyl)-4-yl)methyl)-5-[2-(N-butyryl-N-pyridin-3-ylamino) ethylcarbonyl]-4-ethyl-2-propyl-1H-imidazole, are useful as antihypertensive agents.
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- Novel piperidine σ receptor ligands as potential antipsychotic drugs
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σ receptor ligands represent a new class of potential antipsychotic drugs. This paper presents the structure-activity relationships leading to novel disubstituted piperidine σ ligands, which have little or no affinity for dopamine D2 receptors. Selectivity for σ sites over dopamine D2 or serotonin 5-HT2 receptors appears to be governed by the chemical nature of the piperidine nitrogen substituent, its distance from the basic nitrogen, and its orientation relative to the other piperidine substituent. Several of these compounds have good oral potency in some animal models used to evaluate potential antipsychotic drugs. The N-cyclopropylmethyl ketones and ethers (e.g. 6i (DuP 734), 6q, 18a, and 18n) have the best in vivo potency. Compounds 6i (DuP 734) and 6q did not cause catalepsy in the rat, even at very high doses. On the basis of the pharmacology profiles of these σ ligands, we propose these compounds may be effective antipsychotic drugs, which do not induce extrapyramidal side effects or tardive dyskinesia.
- Gilligan,Cain,Christos,Cook,Drummond,Johnson,Kergaye,McElroy,Rohrbach,Schmidt,Tam
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p. 4344 - 4361
(2007/10/02)
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