The metabolic fate of alpha-terpineol administered orally to male albino-rats was investigated, and its effects on the liver microsomal cytochrome-P-450 system were studied. For metabolic studies, alpha-terpineol was given once daily for 20 days at a dose of 600mg/kg bw; cytochrome-P-450 studies involved dosing for up to 9 days. ...The neutral fraction isolated showed the presence of one major (alpha-terpineol) and two minor compounds. One of the minor compounds was identified as p-menthane-1,2,8-triol. Further study revealed the presence of the methyl esters of oleuropeic-acid and dihydrooleuropeic-acid. Allylic oxidation of C-1 methyl esters appeared to be the major metabolic pathway. It was considered likely that the allylic methyl group at C-7 was oxidized prior to the reduction of the 1,2-double bond. Administration of alpha-terpineol increased the levels of liver microsomal cytochrome-P-450 by 72, 104, 90, 54, and 52% after 1, 2, 3, 6, and 9 days of dosing, respectively. A moderate incr was noted in the levels of liver microsomal NADPH-cytochrome-c-reductase during the first 3 days of repeated dosing. No significant effect was noted on cytochrome-b5 and NADH-cytochrome-c-reductase. The authors conclude that the allylic methyl oxidation of alpha-terpineol is the major route for its metabolic transformation in the rat. The reduction of the endocyclic double bond was specifically noted in the formation of dihydrooleuropeic-acid from oleuropeic-acid.
Biotransformation of alpha-terpineol by the common cutworm (Spodoptera litura) larvae was investigated. alpha-Terpineol was mixed in an artificial diet, and the diet was fed to the larvae (fourth-fifth instar) of S. litura. Metabolites were isolated from the frass and analyzed spectroscopically. Main metabolites were 7-hydroxy-alpha-terpineol (p-menth-1-ene-7,8-diol) and oleuropeic acid (8-hydroxy-p-menth-1-en-7-oic acid). Intestinal bacteria from the frass of larvae did not participate in the metabolism of alpha-terpineol. alpha-Terpineol was preferentially oxidized at the C-7 position (allylic methyl group) by S. litura larvae.
Details of the metabolism of alpha-terpineol by Pseudomonas incognita are presented. Degradation of alpha-terpineol by this organism resulted in the formation of a number of acidic and neutral metabolites. Among the acidic metabolites, beta-isopropyl pimelic acid, 1-hydroxy-4-isopropenyl-cyclohexane-1-carboxylic acid, 8-hydroxycumic acid, oleuropeic acid, cumic acid, and p-isopropenyl benzoic acid have been identified. Neutral metabolites identified were limonene, p-cymene-8-ol, 2-hydroxycineole, and uroterpenol. ... /I/t appears that P. incognita degrades alpha-terpineol by at least three different routes. While one of the pathways seems to operate via oleuropeic acid, a second may be initiated through the aromatization of alpha-terpineol. The third pathway may involve the formation of limonene from alpha-terpineol and its further metabolism.
In a minor pathway, the endocyclic alkene of alpha-terpineol is epoxidized and then hydrolysed to yield a triol metabolite 1,2,8-trihydroxy- para-menthane, which was also reported in humans after inadvertent oral ingestion of a pine-oil disinfectant containing alpha-terpineol.
Metabolized primarily by conjugation with glucuronic acid and excreted in urine. Oxidation of the allylic methyl group followed by hydrogenation to yield the corresponding saturated acid may occur.
IDENTIFICATION AND USE: alpha-Terpineol is a colorless solid. It used in perfumes manufacturing; denaturing fats for soap manufacture; hydrocarbon solvent; solvent for resins, cellulose esters, and ethers; disinfectants; antioxidants; medicines; constituent of flavorings. It is not registered for current pesticide use in the U.S., but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses. HUMAN EXPOSURE AND TOXICITY: In human subjects, alpha-terpineol had a low irritative potency but a strong odor. Two dermatitis patients were reported to be sensitized to alpha-terpineol, although attempts to induce skin sensitization in volunteers using a dilute solution of alpha-terpineol were unsuccessful. Two fatalities described in the literature were both due to accidental ingestion of a pine oil-containing products and were attributed to combined toxicity of isopropanol and 1-alpha-terpineol. The regulatory properties of the essential oil of Melaleuca alternifolia (tea tree oil) on the production of oxygen derived reactive species by human peripheral blood leukocytes activated in vitro was evaluated and found that alpha-terpineol significantly suppressed fMLP-, LPS- and PMA-stimulated superoxide production; suggesting the potential for selective regulation of cell types by these components during inflammation. ANIMAL STUDIES: In rabbits neat alpha-terpineol was a moderate skin irritant. Following acute oral exposure, a low toxicity was generally reported in rodents. Acute toxicity of pine oil (a commercially available disinfectant) after intravenous administration in horses was studied. alpha-Terpineol was identified as a major constituent of pine oil. alpha-Terpineol was recovered from equine tissues after iv injection of 0.1 mL/kg, death due to massive pulmonary edema occurred within minutes. Indirect evidence of liver effects was seen in rats given repeated oral doses. No indication of lung carcinogenicity was seen in a limited study in mice (treated by injection). Terpineol caused a slight but dose-related increase in the number of his+ revertants with Salmonella TA102 tester strain both without and with activation. The effects of terpineol on the compound action potential (CAP) of rat sciatic nerve were studied. Terpineol induced a dose-dependent blockade of the CAP.
Neurotoxin - Acute solvent syndrome
Occupational hepatotoxin - Secondary hepatotoxins: the potential for toxic effect in the occupational setting is based on cases of poisoning by human ingestion or animal experimentation.
Skin Sensitizer - An agent that can induce an allergic reaction in the skin.
来源:Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Gastrointestinal decontamination. Since there is a high risk of aspiration pneumonia, induced emesis is usually considered contraindicated in these poisonings. However, spontaneous emesis may occur due to direct irritation of the gastric mucosa. If the patient is seen within an hour of ingestion and a large amount has been ingested, gastric emptying by intubation and lavage may be considered ... . However, some studies have suggested greater rates of complications with lavage than with ipecac-induced emesis. There is no evidence that activated charcoal is helpful in these poisonings. ... /Pine oil/
来源:Hazardous Substances Data Bank (HSDB)
毒理性
解毒与急救
眼睛去污。如果眼睛接触到有害物质,应进行大量冲洗。
Eye decontamination. If eye exposure has occurred, copious irrigation of the eyes is appropriate.
Pulmonary symptoms. The patient should be observed for at least six hours with any significant ingestion in order to observe the onset of any symptoms, particularly pulmonary symptoms. If any pulmonary symptoms are observed, the patient should have a chest film and measurement of oxygenation, and hospitalization is appropriate. With severe pulmonary symptoms, transfer to an intensive care unit is usually appropriate. With severe aspiration, management should be handled as in any severe aspiration pneumonia, in accordance with accepted medical practice. Other severe systemic effects should be treated in accordance with accepted medical practice.
... After iv injection of 0.1 mL/kg, death due to massive pulmonary edema occurred within minutes. In this animal blood and tissue levels of alpha-terpineol of between 150 and 300 ppm were observed. After smaller doses of pine oil (0.033 mL/kg), horses survived until euthanized up to 48 hr later. Blood levels of alpha-terpineol became undetectable in one of these animals after 2 hr, and no tissue levels were detected at postmortem....
A Method for the Net Contra-thermodynamic Isomerization of Cyclic Trisubstituted Alkenes
作者:Raphaël F. Guignard、Laurent Petit、Samir Z. Zard
DOI:10.1021/ol4018744
日期:2013.8.16
A simple sequence for the net contra-thermodynamic isomerization of cyclic trisubstituted alkenes is reported consisting of a radical addition of p-chlorothiophenol, followed by oxidation to the sulfoxide and thermal syn-elimination to give the least substituted isomeric cycloalkene.
[EN] PHENOTHIAZINE DERIVATIVES AND USES THEREOF<br/>[FR] DÉRIVÉS DE PHÉNOTHIAZINE ET LEURS UTILISATIONS
申请人:CAMP4 THERAPEUTICS CORP
公开号:WO2019195789A1
公开(公告)日:2019-10-10
The present invention provides phenothiazine compounds, processes for their preparation, pharmaceutical compositions comprising the compounds, and the use of the compounds or the compositions in the treatment of various diseases or conditions, for example ribosomal disorders and ribosomopathies, e.g. Diamond Blackfan anemia (DBA).
3. leads to amide products which can be hydrolyzed under mild conditions. The amidation reaction is mild, general and compatible with both primary C−H bonds of tertiary and secondary alcohols, as well as secondary C−H bonds of cyclic secondary alcohols. This method provides an easy access to free 1,2-aminoalcohols after efficient and mild cleavage of the oxime directing group and activated amide.
Preparation of Mono-/Difluorinated Hydrocarbon Compounds
申请人:Saint-Jalmes Laurent
公开号:US20090234151A1
公开(公告)日:2009-09-17
Mono- or difluorinated hydrocarbon compounds are prepared from an alcohol or a carbonylated compound by reacting one of these with a fluorinating reagent, optionally in the presence of a base, the fluorinating agent comprising a pyridinium reactant having the following formula (F), wherein R
0
is an alkyl or cycloalkyl radical:
Fe‐Catalyzed Anaerobic Mukaiyama‐Type Hydration of Alkenes using Nitroarenes
作者:Anup Bhunia、Klaus Bergander、Constantin Gabriel Daniliuc、Armido Studer
DOI:10.1002/anie.202015740
日期:2021.4.6
Hydration of alkenes using first row transitionmetals (Fe, Co, Mn) under oxygen atmosphere (Mukaiyama‐type hydration) is highly practical for alkene functionalization in complex synthesis. Different hydration protocols have been developed, however, control of the stereoselectivity remains a challenge. Herein, highly diastereoselective Fe‐catalyzed anaerobic Markovnikov‐selective hydration of alkenes