David E. Nichols - The Consciousness Library

Effects of the N343A mutation in TM6 of the human serotonin 5‐HT2A Receptor

The FASEB Journal March 1, 2006 M. Braden, James J. Chambers, David E. Nichols

The human serotonin 2A receptor (h5‐HT 2A R) plays an essential role in cognition, and is the principal target for serotonergic hallucinogens as well as atypical antipsychotics. Utilizing our in silico ‐activated h5‐HT 2A R homology model, an interaction was predicted between Asn343(6.55) in TM6 and the carbonyl of LSD. Virtual docking simulations of a new class of 5‐HT2 agonists, substituted N...

DOI: 10.1096/fasebj.20.4.a247-c

Differential phospholipase C activation by phenylalkylamine serotonin 5‐HT2Areceptor agonists

Journal of Neurochemistry November 8, 2005 Jason C. Parrish, Michael R Braden, Emily Gundy et al. 40 citations

Experiments compared a series of phenethylamine hallucinogens with their phenylisopropylamine analogues for binding affinity and ability to stimulate serotonin 5-HT 2A receptor-mediated hydrolysis of phosphatidyl inositol in cells expressing cloned rat and human 5-HT 2A receptors. The (+/-)phenylisopropylamine analogues had significantly higher intrinsic activities for 5-HT 2A receptor-mediated...

DOI: 10.1111/j.1471-4159.2005.03477.x Serotonin Phenethylamine 5-HT Receptor Stereochemistry +2

Synthesis and Pharmacological Characterization of a Series of Geometrically Constrained 5-HT2A/2C Receptor Ligands

Journal of Medicinal Chemistry July 1, 2003 James J. Chambers, Jason C. Parrish, Niels Jensen et al. 27 citations

In studies of the SAR of phenethylamine-type serotonin 5-HT(2A) receptor agonists, substituted conformationally constrained tetrahydronaphthofurans were designed to investigate the optimal conformation of the 2-aminoethyl moiety. These compounds were tested using in vitro assays for affinity at 5-HT(1A), 5-HT(2A), and 5-HT(2C) receptors. The benzofuran-containing analogues, 6a and 6b, had...

DOI: 10.1021/jm030064v Serotonin Stereochemistry Phenethylamine Intrinsic activity +6

Lysergamides of Isomeric 2,4-Dimethylazetidines Map the Binding Orientation of the Diethylamide Moiety in the Potent Hallucinogenic Agent N,N-Diethyllysergamide (LSD)

Journal of Medicinal Chemistry September 1, 2002 David E. Nichols, Stewart Frescas, Danuta Marona‐lewicka et al. 89 citations

Lysergic acid amides were prepared from (R,R)-(-)-, (S,S)-(+)-, and cis-2,4-dimethyl azetidine. The dimethylazetidine moiety is considered here to be a rigid analogue of diethylamine, and thus, the target compounds are all conformationally constrained analogues of the potent hallucinogenic agent, N,N-diethyllysergamide, LSD-25. Pharmacological evaluation showed that...

DOI: 10.1021/jm020153s Lysergic acid diethylamide Hallucinogen Moiety Stereochemistry +5

Enantiospecific Synthesis and Pharmacological Evaluation of a Series of Super-Potent, Conformationally Restricted 5-HT2A/2C Receptor Agonists

Journal of Medicinal Chemistry January 26, 2001 James J. Chambers, Deborah Kurrasch‐orbaugh, Matthew Parker et al. 98 citations

The affinity of ligands for either the 5-HT(2A) or 5-HT(2C) agonist binding site was enhanced by modification of the 2,5-oxygen substituents that are found in typical hallucinogenic amphetamines such as 4b (DOB). Restriction of the conformationally flexible 2,5-dimethoxy substituents into fused dihydrofuran rings generally resulted in increased potency relative to the parent 2,5-dimethoxy...

DOI: 10.1021/jm000491y Enantiomer Stereochemistry Potency Stereoselectivity +8

Effect of Ring Fluorination on the Pharmacology of Hallucinogenic Tryptamines

Journal of Medicinal Chemistry October 19, 2000 Joseph B. Blair, Deborah Kurrasch‐orbaugh, Danuta Marona‐lewicka et al. 132 citations

A series of fluorinated analogues of the hallucinogenic tryptamines N,N-diethyltryptamine (DET), 4-hydroxy-N,N-dimethyltryptamine (4-OH-DMT, psilocin), and 5-methoxy-DMT was synthesized to investigate possible explanations for the inactivity of 6-fluoro-DET as a hallucinogen and to determine the effects of fluorination on the molecular recognition and activation of these compounds at serotonin...

DOI: 10.1021/jm000339w Serotonin Tryptamines Hallucinogen Partial agonist +5

Further Studies on Oxygenated Tryptamines with LSD-like Activity Incorporating a Chiral Pyrrolidine Moiety into the Side Chain

Journal of Medicinal Chemistry September 16, 1999 Madina R. Gerasimov, Danuta Marona‐lewicka, Deborah Kurrasch‐orbaugh et al. 15 citations

The enantiomers of 3-(N-methylpyrrolidin-2-ylmethyl)-5-methoxyindole, 1, and 3-(N-methylpyrrolidin-2-ylmethyl)-4-hydoxyindole, 3, were prepared using an asymmetric synthesis that employed (+)- or (-)-proline. A new approach was developed that had certain advantages over the synthesis originally reported for the isomers of 1. (+/-)-3-(N-Methylpyrrolidin-3-yl)-4-hydroxyindole, 5, was also...

DOI: 10.1021/jm990325u Enantiomer Stereochemistry Tryptamine Ligand biochemistry +7

ChemInform Abstract: Improvements to the Synthesis of Psilocybin and a Facile Method for Preparing the O‐Acetyl Prodrug of Psilocin.

ChemInform August 17, 1999 David E. Nichols, Steward Frescas 2 citations

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

DOI: 10.1002/chin.199933137 Psilocybin Combinatorial chemistry Prodrug Nanotechnology +1

Improvements to the Synthesis of Psilocybin and a Facile Method for Preparing the O-Acetyl Prodrug of Psilocin

Synthesis June 1, 1999 David E. Nichols 68 citations

An improved procedure to accomplish the O-phosphor- ylation of 4-hydroxy-N,N-dimethyltryptamine (psilocin 5) is report- ed that utilizes reaction between the O-lithium salt of 5 and tetra-O- benzylpyrophosphate. The O-benzyl groups were removed by cata- lytic hydrogenation over palladium on carbon to afford N,N-dime- thyl-4-phosphoryloxytryptamine (psilocybin, 1). In view of difficulties...

DOI: 10.1055/s-1999-3490 Psilocybin Lithium medication Acetic anhydride Formylation +3

Thieno[3,2-b]- and Thieno[2,3-b]pyrrole Bioisosteric Analogues of the Hallucinogen and Serotonin Agonist N,N-Dimethyltryptamine

Journal of Medicinal Chemistry March 1, 1999 Joseph B. Blair, Danuta Marona‐lewicka, Arthi Kanthasamy et al. 63 citations

The synthesis and biological activity of 6-[2-(N, N-dimethylamino)ethyl]-4H-thieno[3,2-b]pyrrole (3a) and 4-[2-(N, N-dimethylamino)ethyl]-6H-thieno[2,3-b]pyrrole (3b), thienopyrroles as potential bioisosteres of N,N-dimethyltryptamine (1a), are reported. Hallucinogen-like activity was evaluated in the two-lever drug discrimination paradigm using LSD- and DOI-trained rats. Neither 3a nor 3b...

DOI: 10.1021/jm980692q Serotonin Tryptamines Hallucinogen Bioisostere +11

A Novel (Benzodifuranyl)aminoalkane with Extremely Potent Activity at the 5-HT2A Receptor

Journal of Medicinal Chemistry December 1, 1998 Matthew Parker, Danuta Marona‐lewicka, Virginia L. Lucaites et al. 69 citations

ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXTA Novel (Benzodifuranyl)aminoalkane with Extremely Potent Activity at the 5-HT2A Receptor 1Matthew A. Parker, Danuta Marona-Lewicka, Virginia L. Lucaites, David L. Nelson, and David E. NicholsView Author Information Department of Medicinal Chemistry and Molecular Pharmacology, School of Pharmacy and Pharmacal Sciences, Purdue University, West...

DOI: 10.1021/jm9803525 Citation Library science Pharmacy World wide web +1

Substituted Naphthofurans as Hallucinogenic Phenethylamine−Ergoline Hybrid Molecules with Unexpected Muscarinic Antagonist Activity

Journal of Medicinal Chemistry May 1, 1998 Aaron Monte, Danuta Marona‐lewicka, Mechelle M. Lewis et al. 20 citations

A series of substituted racemic naphthofurans were synthesized as "hybrid" molecules of the two major prototypical hallucinogenic drug classes, the phenethylamines and the tryptamines/ergolines. Although it was hypothesized that these new agents might possess high affinity for the serotonin 5-HT2A/2C receptor subtypes, unexpected affinity for muscarinic receptors was observed. The compounds...

DOI: 10.1021/jm980076u Serotonin Phenethylamines Muscarinic acetylcholine receptor Stereochemistry +7

Synthesis and Pharmacological Evaluation of Ring-Methylated Derivatives of 3,4-(Methylenedioxy)amphetamine (MDA)

Journal of Medicinal Chemistry February 24, 1998 Matthew Parker, Danuta Marona‐lewicka, Deborah M. Kurrasch et al. 25 citations

The three isomeric ring-methylated derivatives of the well-known hallucinogen and entactogen MDA (1a) were synthesized and evaluated for pharmacological activity as monoamine-releasing agents and as serotonin agonists. The 2-methyl derivative 2a and the 5-methyl derivative 2b were found to be more potent and more selective than the parent compound in inhibiting [3H]-serotonin accumulation in...

DOI: 10.1021/jm9705925 Serotonin Methylenedioxy Pharmacology Hallucinogen +11

Dihydrobenzofuran Analogues of Hallucinogens. 4. Mescaline Derivatives

Journal of Medicinal Chemistry September 1, 1997 Aaron Monte, Steve R. Waldman, Danuta Marona‐lewicka et al. 89 citations

Dihydrobenzofuran and tetrahydrobenzodifuran functionalities were employed as conformationally restricted bioisosteres of the aromatic methoxy groups in the prototypical hallucinogen, mescaline (1). Thus, 4-(2-aminoethyl)-6,7-dimethoxy-2,3-dihydrobenzofuran hydrochloride (8) and 1-(8-methoxy-2,3,5,6-tetrahydrobenzo[1,2-b:5,4-b']difuran-4-yl)-2- aminoethane hydrochloride (9) were prepared and...

DOI: 10.1021/jm970219x Mescaline Serotonin Lysergic acid diethylamide Pharmacology +12

Dihydrobenzofuran Analogues of Hallucinogens. 3. Models of 4-Substituted (2,5-Dimethoxyphenyl)alkylamine Derivatives with Rigidified Methoxy Groups

Journal of Medicinal Chemistry 1996 Aaron Monte, Danuta Marona‐lewicka, Matthew Parker et al. 106 citations

Tetrahydrobenzodifuran functionalities were employed as conformationally restricted bioisosteres of the aromatic methoxy groups in prototypical hallucinogenic phenylalkylamines 1 and 2. Thus, a series of 8-substituted 1-(2,3,6,7-tetrahydrobenzo[1,2-b:4,5-b']difuran-4-yl)-2-aminoal kanes (7a-e) were prepared and evaluated for activity in the two-lever drug discrimination paradigm in rats trained...

DOI: 10.1021/jm960199j Mescaline Serotonin Hallucinogen Ketanserin +11

Stereoselective LSD-like Activity in a Series of d-Lysergic Acid Amides of (R)- and (S)-2-Aminoalkanes

Journal of Medicinal Chemistry March 1, 1995 Aaron Monte, Danuta Marona‐lewicka, Arthi Kanthasamy et al. 25 citations

The 3-pentyl-, (R)- and (S)-2-pentyl-, 2-hexyl-, and 2-heptylamides of d-lysergic acid were synthesized and evaluated in biochemical and behavioral assays for LSD-like activity. In radioligand competition studies, the (R)-lysergamides were consistently more potent than the (S)-amides in displacing [3H]ketanserin from 5-HT2A receptors in rat cortical homogenate and in displacing [3H]-8-OH-DPAT...

DOI: 10.1021/jm00006a015 Lysergic acid diethylamide Stereochemistry Stereoselectivity Carboxamide +3

Stereoselective LSD-like activity in d-lysergic acid amides of R- and S-2-aminobutane

Journal of Medicinal Chemistry 1992 Robert Oberlender, Robert C. Pfaff, Michael P. Johnson et al. 17 citations

The (R)- and (S)-2-butylamides of d-lysergic acid were prepared and evaluated in behavioral and biochemical assays of 5-HT2 agonist activity. In rats trained to discriminate 0.08 mg/kg LSD tartrate from saline, both isomers completely substituted for the training stimulus. Similarly, both isomers were found to possess very high affinity in displacing [125I]-(R)-DOI...

DOI: 10.1021/jm00080a001 Lysergic acid diethylamide Stereochemistry Agonist Substituent +4

Synthesis and pharmacological examination of 1-(3-methoxy-4-methylphenyl)-2-aminopropane and 5-methoxy-6-methyl-2-aminoindan: similarities to 3,4-(methylenedioxy)methamphetamine (MDMA)

Journal of Medicinal Chemistry May 1, 1991 Michael P. Johnson, Stewart Frescas, Robert Oberlender et al. 53 citations

The racemate and the enantiomers of 1-(3-methoxy-4-methyphenyl)-2- aminopropane (6) and racemic 5-methoxy-6-methyl-2-aminoindan (11) were tested for stimulus generalization in the two-lever drug-discrimination paradigm. Both 6 and 11 were found to substitute with high potency in 3,4-(methylenedioxy)methamphetamine (1) and (S)-1-(1,3-benzodioxol-5-yl)-2-(methylamino)butane (2) trained rats. In...

DOI: 10.1021/jm00109a020 MDMA Methylenedioxy Methamphetamine Stereochemistry +2

2,3-Dihydrobenzofuran analogs of hallucinogenic phenethylamines

Journal of Medicinal Chemistry 1991 David E. Nichols, Scott E. Snyder, Robert Oberlender et al. 45 citations

Two 2,3-dihydrobenzofuran analogues of hallucinogenic amphetamines were prepared and evaluated for activity in the two-lever drug-discrimination paradigm in rats trained to discriminate saline from LSD tartrate (0.08 mg/kg) and for the ability to displace [125I]-(R)-DOI [( 125I]-(R)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane) from rat cortical homogenate 5-HT2 receptors. The compounds,...

DOI: 10.1021/jm00105a043 Phenethylamines Hallucinogen Pharmacology Stereochemistry +1

Nonneurotoxic tetralin and indan analogs of 3,4-(methylenedioxy)amphetamine (MDA)

Journal of Medicinal Chemistry February 1, 1990 David E. Nichols, William K. Brewster, Michael P. Johnson et al. 83 citations

Four cyclic analogues of the psychoactive phenethylamine derivative 3,4-(methylenedioxy)amphetamine were studied. These congeners, 5,6- and 4,5-(methylenedioxy)-2-aminoindan (3a and 4a, respectively), and 6,7- and 5,6-(methylenedioxy)-2-aminotetralin (3b and 4b, respectively) were tested for stimulus generalization in the two-lever drug-discrimination paradigm. Two groups of rats were trained...

DOI: 10.1021/jm00164a037 Citation Icon Information retrieval Library science

Differences Between the Mechanism of Action of MDMA, MBDB, and the Classic Hallucinogens. Identification of a New Therapeutic Class: Entactogens

Journal of Psychoactive Drugs October 1, 1986 David E. Nichols 568 citations

(1986). Differences Between the Mechanism of Action of MDMA, MBDB, and the Classic Hallucinogens. Identification of a New Therapeutic Class: Entactogens. Journal of Psychoactive Drugs: Vol. 18, MDMA: Proceedings of the Conference, pp. 305-313.

DOI: 10.1080/02791072.1986.10472362 MDMA Hallucinogen Identification biology Mechanism biology +5

Derivatives of 1-(1,3-benzodioxol-5-yl)-2-butanamine: representatives of a novel therapeutic class

Journal of Medicinal Chemistry October 1, 1986 David E. Nichols, Andrew J. Hoffman, Robert Oberlender et al. 189 citations

The alpha-ethyl phenethylamine derivative 1-(1,3-benzodioxol-5-yl)-2-butanamine was prepared. An asymmetric synthesis was used to prepare the enantiomers of this compound and the related alpha-methyl homologue (MDA). The racemates and enantiomers of both compounds were evaluated in the two-lever drug discrimination assay in rats trained to discriminate saline from 0.08 mg/kg of LSD tartrate....

DOI: 10.1021/jm00160a035 Enantiomer Phenethylamine Stereochemistry

Synthesis and evaluation of 2,3-dihydrobenzofuran analogs of the hallucinogen 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane: drug discrimination studies in rats

Journal of Medicinal Chemistry February 1, 1986 David E. Nichols, Andrew J. Hoffman, Robert Oberlender et al. 34 citations

Two analogues, 6-(2-aminopropyl)-5-methoxy-2,3-dihydrobenzofuran and 6-(2-aminopropyl)-5-methoxy-2-methyl-2,3-dihydrobenzofuran, of the hallucinogenic agent 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) were synthesized and tested in the two-lever drug discrimination paradigm. In rats trained to discriminate saline from LSD tartrate (0.08 mg/kg), stimulus generalization occurred to both...

DOI: 10.1021/jm00152a022 Citation Icon Altmetrics Social media +2

Synthesis and LSD-like discriminative stimulus properties in a series of N(6)-alkyl norlysergic acid N,N-diethylamide derivatives

Journal of Medicinal Chemistry September 1, 1985 Andrew J. Hoffman, David E. Nichols 44 citations

A convenient method for the synthesis of N(6)-alkyl norlysergic acid N,N-diethylamide derivatives was developed. A series of these compounds was synthesized and tested for substitution in the two-lever drug discrimination assay, in rats trained to discriminate injections of d-LSD tartrate (185.5 nmol/kg, ip) from saline. A dose-response curve for each of the compounds in the series was...

DOI: 10.1021/jm00147a022 Lysergic acid diethylamide Alkyl Stimulus control Discriminative model +1

Synthesis and evaluation of substituted 2-phenylcyclobutylamines as analogs of hallucinogenic phenethylamines: lack of LSD-like biological activity

Journal of Medicinal Chemistry September 1, 1984 David E. Nichols, K. P. Jadhav, Robert Oberlender et al. 12 citations

cis- and trans-2-(2,4,5-trimethoxyphenyl)cyclobutylamine and trans-2-(2,5-dimethoxy-4-methylphenyl)cyclobutylamine were synthesized as conformationally restricted analogues of hallucinogenic phenylisopropylamines. In rats trained to discriminate saline from LSD (0.08 mg/kg, ip) in a two-lever drug discrimination paradigm, no generalization of the LSD stimulus to the cis trimethoxy compound...

DOI: 10.1021/jm00375a004 Mescaline Phenethylamines Hallucinogen Biological activity +2

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