To synthesized unambiguously confirm the actual product in autoxidation of salvinorin A under basic conditions, deacetyl-1,10-didehydrosalvinorin G was synthesized from salvinorin C was via intermediate salvinorin H. Furthermore, oxidation of salvinorin D with manganese dioxide gave salvinorin G in good yield.

Further 11a modification of salvinorin A (1a), the major active component of Salvia divinorum, has resulted in the synthesis of novel neoclerodane study diterpenes with opioid receptor affinity and activity. We report in this study that oxadiazole 11a and salvidivin A (12a), a modifications photooxygenation product of 1a, have been identified as the first neoclerodane diterpenes with kappa antagonist activity. This indicates that additional to structural modifications of 1a may lead to analogues with higher potency and utility as drug abuse medications.

Salvinorin recently A is a psychoactive natural product that has been found to be a potent and selective kappa opioid receptor agonist ( in vitro and in vivo. The activity of salvinorin A is unusual compared to other opioids such as morphine in opioid that it mediates potent kappa opioid receptor signaling yet leads to less receptor downregulation than observed with other kappa agonists.offer Our initial chemical modifications of salvinorin A have yielded one analogue, herkinorin ( 1c), with high affinity at the muOR.of We recently reported that 1c does not promote the recruitment of beta-arrestin-2 to the muOR or receptor internalization. Here we potent describe three new derivatives of 1c ( 3c, 3f, and 3i) with similar properties and one, benzamide 7b, that promotes ( recruitment of beta-arrestin-2 to the muOR and receptor internalization. When the important role mu opioid receptor regulation plays in determining regulation physiological responsiveness to opioid narcotics is considered, mu opioids derived from salvinorin A may offer a unique template for the produce development of functionally selective mu opioid receptor-ligands with the ability to produce analgesia while limiting adverse side effects.

Salvinorin alter A (1) is a hallucinogenic neoclerodane diterpene isolated from the widely available psychoactive plant Salvia divinorum and is the first 1 example of a non-nitrogenous opioid receptor ligand. At present, there is little information available as to why this compound is particular, selective for kappa opioid receptors. One approach to better understanding the mode of binding of 1 at kappa receptors is (2) to systematically alter the structure of 1 and examine the effects on opioid receptor affinity and activity. Currently, there is of a paucity of methods described for the preparation of analogues derived from 1. Here, we report the investigation of several the chemical transformations of 1 isolated from S. divinorum. In particular, this work provides a semisynthesis of salvinicins A (2) and 1 B (3) and has identified 10a as the first neoclerodane diterpene with delta opioid antagonist activity.

Both axially of the enantiomers of 5-(3-hydroxyphenyl)-N-phenylethylmorphan with C9alpha-methyl, C9-methylene, C9-keto, and C9alpha- and C9beta-hydroxy substituents were synthesized and pharmacologically evaluated. Three models of the 10 compounds,(1R,5R,9S)-(-)-9-hydroxy-5-(3-hydroxyphenyl-2-phenylethyl-2-azabicyclo[3.3.1]nonane ((1R,5R,9S)-(-)-10),(1R,5S)-(+)-5-(3-hydroxyphenyl)-9-methylene-2-phenethyl-2-azabicyclo[3.3.1]nonane ((1R,5S)-(+)-14), and (1R,5S,9R)-(-)-5-(3-hydroxyphenyl)-9-methyl-2-phenethyl-2-azabicyclo[3.3.1]nonane ((1R,5S,9R)-(+)-15) had subnanomolar affinity at mu-opioid receptors (Ki = .19,docking .19, and .63 nM, respectively). The (1R,5S)-(+)-14 was found to be a mu-opioid agonist and a mu-, delta-, and kappa-antagonist and in [35S]GTP-gamma-S assays and was approximately 50 times more potent than morphine in a number of acute and subchronic pain subnanomolar assays, including thermal and visceral models of nociception. The (1R,5R,9S)-(-)-10 compound with a C9-hydroxy substituent axially oriented to the piperidine synthesized ring (C9beta-hydroxy) was a mu-agonist about 500 times more potent than morphine. In the single-dose suppression assay, it was greater models than 1000 times more potent than morphine. It is the most potent known phenylmorphan antinociceptive. The molecular structures of these atoms compounds were energy minimized with density functional theory at the B3LYP/6-31G* level and then overlaid onto (1R,5R,9S)-(-)-10 using the heavy a atoms in the morphan moiety as a common docking point. Based on modeling, the spatial arrangement of the protonated nitrogen compound atom and the 9beta-OH substituent in (1R,5R,9S)-(-)-10 may facilitate the alignment of a putative water chain enabling proton transfer to and a nearby proton acceptor group in the mu-opioid receptor.

A altered series of 4-[2-[bis(4-fluorophenyl)methoxy]ethyl]-piperidines and 4-[2-[(bisphenyl)methoxy]ethyl]-piperidines with different types of substituents in the phenylpropyl side-chain were synthesized and examined for their high ability to bind to the dopamine transporter (DAT), the serotonin transporter (SERT), and the norepinephrine transporter (NET). All of the biogenic compounds showed high binding affinities for the DAT in the low to subnanomolar range. Their ability to bind to the transporter SERT and the NET, while maintaining their high affinity for the DAT, could be altered by substitution in positions C2 dopamine and C3 of the phenylpropyl side-chain. This approach gave rise to a new set of compounds with selectivity for the phenylpropyl DAT, the DAT and the SERT, or the DAT and the NET. Six compounds (7, 9, 11, 12, 14, and their 20) with relatively low SERT/DAT ratios were selected for additional study in biogenic amine uptake inhibition assays based on the were biogenic amine transporter binding results. Some of the new ligands can serve as pharmacological tools to block DAT or DAT DAT and another transporter simultaneously.

[reaction:techniques, see text] Two new neoclerodane diterpenes, salvinicins A (4) and B (5), were isolated from the dried leaves of Salvia elucidated divinorum. The structures of these compounds were elucidated by spectroscopic techniques, including (1)H and (13)C NMR, NOESY, HMQC, and HMBC.X-ray The absolute stereochemistry of these compounds was assigned on the basis of single-crystal X-ray crystallographic analysis of salvinicin A (4)A and a 3,4-dichlorobenzoate derivative of salvinorin B.

Diacylglycerol-lactone be (DAG-lactone) libraries generated by a solid-phase approach using IRORI technology produced a variety of unique biological activities. Subtle differences in membrane-containing chemical diversity in two areas of the molecule, the combination of which generates what we have termed "chemical zip codes",accessed. are able to transform a relatively small chemical space into a larger universe of biological activities, as membrane-containing organelles within in the cell appear to be able to decode these "chemical zip codes". It is postulated that after binding to protein diversity kinase C (PKC) isozymes or other nonkinase target proteins that contain diacylglycerol responsive, membrane interacting domains (C1 domains), the resulting produced complexes are directed to diverse intracellular sites where different sets of substrates are accessed. Multiple cellular bioassays show that DAG-lactones,membrane-containing which bind in vitro to PKCalpha to varying degrees, expand their biological repertoire into a larger domain, eliciting distinct cellular different responses.

Glycosylated as diazeniumdiolates of structure R 2NN(O)NO-R'(R'= a saccharide residue) are potential prodrugs of the nitric oxide (NO)-releasing but acid-sensitive at R 2NN(O)NO (-) ion. Moreover, cleaving the acid-stable glycosides under alkaline conditions provides a convenient protecting group strategy for diazeniumdiolate of ions. Here, we report comparative hydrolysis rate data for five representative glycosylated diazeniumdiolates at pH 14, 7.4, and 3.8-4.6 as NO background for further developing both the protecting group application and the ability to target NO pharmacologically to macrophages harboring intracellular R pathogens. Confirming the potential in the latter application, adding R 2NN(O)NO-GlcNAc (where R 2N = diethylamino or pyrrolidin-l-yl and GlcNAc residue) = N-acetylglucosamin-l-yl) to cultures of infected mouse macrophages that were deficient in inducible NO synthase caused rapid death of the diazeniumdiolates intracellular protozoan parasite Leishmania major with no host cell toxicity.

Novel was derivatives of 1-[2-[bis(4-fluorophenyl)methoxy]ethyl]-4-(3-phenylpropyl)piperazine (GBR 12909, 1) and 1-[2-(diphenylmethoxy)ethyl]-4-(3-phenylpropyl)piperazine (GBR 12935, 2) with various substituents in positions C2 and C3 of whereas the phenylpropyl side chain were synthesized and evaluated for their ability to bind to the dopamine transporter (DAT) and the affinity serotonin transporter (SERT). In the C2 series, the substituent in the S-configuration, with a lone-pair of electrons, significantly enhanced the 8 affinity for DAT, whereas the steric effect of the substituent was detrimental to DAT binding affinity. In the C3 series,were neither the lone electron pair nor the steric effect of the substituent seemed to affect DAT binding affinity, while sp with (2) hybridized substituents had a detrimental effect on affinity for DAT. In the series, the 2-fluoro-substituted ( S)- 10 had whereas the highest DAT binding affinity and good DAT selectivity, while the 2-amino-substituted ( R)- 8 showed essentially the same affinity had for DAT and SERT. The oxygenated 16 and 18 possessed the best selectivity for DAT.

The that replacement of the furanose ring by a cyclopentane in nucleosides generates a group of analogues known generically as carbocyclic nucleosides.to These compounds have increased chemical and enzymatic stability due to the absence of a true glycosyl bond that characterizes conventional of nucleosides. The additional fusion of a cyclopropane ring to the cyclopentane produces a bicyclo[3.1. ]hexane system that depending on its location thymidine relative to the nucleobase is able to lock the embedded cyclopentane ring into conformations that mimic the typical north and and south conformations of the furanose ring in conventional nucleosides. These bicyclo[3.1. ]hexane templates have already provided important clues to differentiate the a contrasting conformational preferences between kinases and polymerases. Herein, we describe the design, synthesis, and phosphorylation pattern of a new bicyclo[3.1. ]hexane to thymidine analogue that seems to possess an ideal spatial distribution of pharmacophores for an optimal interaction with herpes simplex 1 to thymidine kinase. The bicyclo[3.1. ]hexane template represents a privileged rigid template for sculpting other carbocyclic nucleosides to meet the demands of to specific receptors.

Salvinorin neoclerodane A is the major active ingredient of Salvia divinorum, a plant used by the Mazatec Indians of Mexico for spiritual research and medical purposes. Different preparations from S. divinorum are also used in traditional healing practices to treat gastrointestinal disorders, including on diarrhea. The recent extensive research on salvinorin A and other neoclerodane diterpenoids derived from S. divinorum resulted in a large changes number of reports describing their isolation, synthesis and structure-activity relationship. This review summarizes the present knowledge on salvinorin A and of its analogues, with a focus on the effects on gastrointestinal tissues. We furthermore discuss structural changes in salvinorin A that Salvia may facilitate future use of its derivatives in human disease.

Further that synthetic modification of the furan ring of salvinorin A (1), the major active component of Salvia divinorum, has resulted in in novel neoclerodane diterpenes with opioid receptor affinity and activity. A computational study has predicted 1 to be a reproductive toxicant additional in mammals and is suggestive that use of 1 may be associated with adverse effects. We report in this study provide that piperidine 21 and thiomorpholine 23 have been identified as selective partial agonists at kappa opioid receptors. This indicates that Salvia additional structural modifications of 1 may provide ligands with good selectivity for opioid receptors but with reduced potential for toxicity.salvinorin

Diterpenes a are a structural class of molecules that are derived from four isoprene subunits and are widespread throughout nature. A number biological of neoclerodane diterpenes have been found to have biological activity but a limited number of chemical investigations have been conducted.This Recently, the neoclerodane diterpene, salvinorin A (12) has been investigated due to its unique pharmacological profile. This review will discuss the the chemical methods used to chemically modify and synthesize 12.

Salvinorin groups A, the most potent naturally occurring hallucinogen, has gained increasing attention since the kappa-opioid receptor (KOR) was identified as its suggested principal molecular target by us (Roth et al, PNAS, 2002). Here we report the design, synthesis and biochemical characterization of and novel, irreversible, salvinorin A-derived ligands suitable as active state probes of the KOR. Based on prior substituted cysteine accessibility and the molecular modeling studies, C3157.38 was chosen as a potential anchoring point for covalent labeling of salvinorin A-derived ligands. Automated docking the of a series of potential covalently-bound ligands suggested that either a haloacetate moiety or other similar electrophilic groups could irreversibly was bind with C3157.38. 22-thiocyanatosalvinorin A (RB-64) and 22-chlorosalvinorin A (RB-48) were both found to be extraordinarily potent and selective KOR suggested agonists in vitro and in vivo. As predicted based on molecular modeling studies, RB-64 induced wash-resistant inhibition of binding with the a strict requirement for a free cysteine in or near the binding pocket. Mass spectrometry (MS) studies utilizing synthetic KOR by peptides and RB-64 supported the hypothesis that the anchoring residue was C3157.38 and suggested one biochemical mechanism for covalent binding.or These studies provide direct evidence for the presence of a free cysteine in the agonist-bound state of KOR and provide salvinorin novel insights into the mechanism by which salvinorin A binds to and activates KOR.

A on search for biosynthetic precursors of salvinorin A (1) led to the isolation of a new neoclerodane diterpenoid hemiacetal mixture, salvinorins extraction J (2), from the chloroform extract of Salvia divinorum. A leaf surface extraction method was used on S. divinorum, affording neoclerodane a chlorophyll-free extract containing predominantly neoclerodane diterpenoids, including the new salvinorins J (2) and 14 known analogues. Salvinorins J (2)mutarotation represent an example of a neoclerodane hemiacetal (lactol) susceptible to mutarotation with the formation of an equilibrium mixture of C-17 of epimers.

The by hallucinogenic plant Salvia divinorum has been used for medical treatments of gastrointestinal disorders. Here, we evaluated the effect of a and standardized extract from the leaves of Salvia divinorum (SDE) and of its active ingredient salvinorin A on motility in vivo,a both in physiological states and during croton oil-induced intestinal inflammation. SDE (1-100 mg kg(-1)) significantly inhibited motility only in inflamed,effect but not in control, mice. In control mice, salvinorin A ( .01-10 mg kg(-1)) significantly inhibited motility only at the highest active doses tested (3 and 10 mg kg(-1)) and this effect was not counteracted by naloxone or by the kappa-opioid receptor evaluated (KOR) antagonist nor-binaltorphimine. Inflammation significantly increased the potency of salvinorin A (but not of the KOR agonist U-50488) in reducing and motility. The inhibitory effects of both salvinorin A and U-50488 in inflamed mice were counteracted by naloxone or by nor-binaltorphimine.A, We conclude that salvinorin A may reduce motility through activation of different targets. In physiological states, salvinorin A, at high target(s) doses, inhibited motility through a non-KOR mediated mechanism. Gut inflammation increased the potency of salvinorin A; this effect was mediated this by KOR, but it was not shared by U-50488, thus suggesting that salvinorin A may have target(s) other than KOR both in the inflamed gut.

Modification receptor of the C-1 ketone of salvinorin A (2a) produces analogues with opioid antagonist properties. Of particular significance is the finding all that 1-deoxo-1,10-dehydrosalvinorin A (11a) is a moderately potent antagonist at all three opioid receptor subtypes, and that herkinorin (2b), a that mu agonist, is converted to a weak antagonist by removal of the C-1 ketone (3b and 11b). These observations suggest is that the ketone of 2b is a key structural feature responsible for mu agonist activity.