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Wednesday, 30 November 2016


Abstract Image

An efficient process for the preparation of 1-(2-methoxyphenoxy)-2,3-epoxypropane, a key intermediate for the synthesis of ranolazine is described.



Preparation of 1-(2-Methoxyphenoxy)-2,3-epoxypropane 4.
To a stirring solution of 2-methoxy phenol 2 (10 kg, 80.55 mol) and water (40 L) at about 30 °C was added sodium hydroxide (1.61 kg, 40.25 mol) and water (10 L). After stirring for 30−45 min, epichlorohydrin 3 (22.35 kg, 241.62 mol) was added and stirred for 10−12 h at 25−35 °C. Layers were separated, and water (40 L) was added to the organic layer (bottom layer) containing product. Sodium hydroxide solution (3.22 kg, 80.5 mol) and water (10 L) were added at 27 °C and stirred for 5−6 h at 27 °C.
The bottom product layer was separated and washed with sodium hydroxide solution (3.0 kg 75 mol) and water (30 L). Excess epichlorohydrin (3) was recovered by distillation of the product layer at below 90 °C under vacuum (650−700 mmHg) to give 13.65 kg (94%) of title compound with 98.3% purity by HPLC, 0.2% of 2- methoxy phenol 2, 0.1% of epichlorohydrin 3, 0.1% of chlorohydrin 11, 0.3% of dimer 12 and 0.3% of dihydroxy 13.

1 H NMR (400 MHz, CDCl3, δ) 6.8−7.0 (m, 4H), 4.3 (dd, J = 5.6 Hz, 5.4 Hz, 1H), 3.8 (dd, J = 5.6 Hz, 5.3 Hz, 1H), 3.7 (s, 3H), 3.2−3.4 (m, 1H), 2.8 (dd, J = 5.6 Hz, 5.4 Hz, 1H), 2.7 (dd, J = 5.6 Hz, 5.3 Hz, 1H);

IR (KBr, cm−1 ) 2935 (C−H, aliphatic), 1594 and 1509 (CC, aromatic), 1258 and 1231 (C−O−C, aralkyl ether), 1125 and 1025 (C−O−C, epoxide);

MS (m/z) 181 (M+ + H).

Compound Details


CAS 2210-74-4
Glycidyl 2-methoxyphenyl ether

Guaiacol glycidyl ether






An Efficient Synthesis of 1-(2-Methoxyphenoxy)-2,3-epoxypropane: Key Intermediate of β-Adrenoblockers

 Innovation Plaza, IPD, R&D, Dr. Reddy’s Laboratories Ltd., Survey Nos. 42, 45,46, and 54, Bachupally, Qutubullapur – 500073, Andhra Pradesh, India
 Institute of Science and Technology, Center for Environmental Science, JNT University, Kukatpally, Hyderabad – 500 072, Andhra Pradesh, India
Org. Process Res. Dev.201216 (10), pp 1660–1664
DOI: 10.1021/op300056k
Publication Date (Web): September 14, 2012
Copyright © 2012 American Chemical Society
*Telephone: +91 4044346000. Fax: +91 4044346285. E-mail: rakeshwarb@drreddys.com.

////////////////1-(2-Methoxyphenoxy)-2,3-epoxypropane,  β-Adrenoblockers, ranolazine


Glycidyl 2-methylphenyl ether technical grade, 90%

Tuesday, 29 November 2016




2-((diphenylmethyl)sulfinyl)-acetohydroxamicaci;2-((diphenylmethyl)sulfinyl)-n-hydroxy-acetamid;2-((diphenylmethyl)sulfinyl)-n-hydroxyacetamide;2-(benzhydrylsulfinyl)acetohydroxamicacid;ADRAFINIL;2-[(DIPHENYLMETHYL)SULFINYL]ACETOHYDROXAMIC ACID;CRL 40028;OLMIFON
  • CAS 63547-13-7
  • MF:C15H15NO3S
  • MW:289.35
  • EINECS:264-303-1


Adrafinil is touted mainly for its stimulant properties and ability to provide alertness and wakefulness.
  • Stay up late/stay awake during normal sleeping hours: Adrafinil may be helpful for night workers who need a kick-start adapting their body’s natural circadian rhythm of wakefulness in the daytime and sleepiness in the evening to their job needs. This can also make it helpful for periodic late-night study sessions. Adrafinil is best taken in the afternoon or evening for nighttime wakefulness.
  • Boost energy, alertness, and focus during the day time: Adrafinil can also be used as an energy-boost during waking hours.
Adrafinil (INN) (brand name Olmifon)[2] is a discontinued wakefulness-promoting agent (or eugeroic) that was formerly used inFrance to promote vigilance (alertness), attentionwakefulnessmood, and other parameters, particularly in the elderly.[3][4] It was also used off-label by individuals who wished to avoid fatigue, such as night workers or others who needed to stay awake and alert for long periods of time. Additionally, "adrafinil is known to a larger nonscientific audience, where it is considered to be a nootropic agent."[3] Adrafinil is a prodrug; it is primarily metabolized in vivo to modafinil, resulting in very similar pharmacological effects.[3] Unlike modafinil, however, it takes time for the metabolite to accumulate to active levels in the bloodstream. Effects usually are apparent within 45–60 minutes when taken orally on an empty stomach. Adrafinil was marketed in France under the trade name Olmifon[2] until September 2011 when it was voluntarily discontinued.[4]



Because α1-adrenergic receptor antagonists were found to block effects of adrafinil and modafinil in animals, "most investigators assume[d] that adrafinil and modafinil both serve as α1-adrenergic receptor agonists."[3] However, adrafinil and modafinil have not been found to bind to the α1-adrenergic receptor and they lack peripheral sympathomimetic side effects associated with activation of this receptor;[5] hence, the evidence in support of this hypothesis is weak, and other mechanisms are probable.[3] Modafinil was subsequently screened at a variety of targets in 2009 and was found to act as a weak, atypical blocker of the dopamine transporter(and hence as a dopamine reuptake inhibitor), and this action may explain some or all of its pharmacological effects.[6][7][8] Relative to adrafinil, modafinil possesses greater specificity in its action, lacking or having a reduced incidence of many of the common side effects of the former (including stomach painskin irritationanxiety, and elevated liver enzymes with prolonged use).[9][10][11] There is a case report of two patients that adrafinil may increase interest in sex.[3] A case report of adrafinil-induced orofacial dyskinesia exists.[12][13] Reports of this side effect also exist for modafinil.[12]


In addition to modafinil, adrafinil also produces modafinil acid (CRL-40467) and modafinil sulfone (CRL-41056) as metabolites, which form from metabolic modification of modafinil.


Adrafinil was discovered in 1974 by two chemists working for the French pharmaceutical company Laboratoires Lafon who were screening compounds in search of analgesics.[14] Pharmacological studies of adrafinil instead revealed psychostimulant-like effects such as hyperactivity and wakefulness in animals.[14] The substance was first tested in humans, specifically for the treatment of narcolepsy, in 1977–1978.[14] Introduced by Lafon (now Cephalon), it reached the market in France in 1984,[4] and for the treatment of narcolepsy in 1985.[14][15] In 1976, two years after the discovery of adrafinil, modafinil, its active metabolite, was discovered.[14] Modafinil appeared to be more potent than adrafinil in animal studies, and was selected for further clinical development, with both adrafinil and modafinil eventually reaching the market.[14] Modafinil was first approved in France in 1994, and then in the United States in 1998.[15] Lafon was acquired by Cephalon in 2001.[16] As of September 2011, Cephalon has discontinued Olmifon, its adrafinil product, while modafinil continues to be marketed.[4]

Society and culture


Athletic doping

Adrafinil and its active metabolite modafinil were added to the list of substances prohibited for athletic competition according to World Anti-Doping Agency in 2004.[17]

New Zealand

In 2005 a Medical Classification Committee in New Zealand recommended to MEDSAFE NZ that adrafinil be classified as a prescription medicine due to risks of it being used as a party drug. At that time adrafinil was not scheduled in New Zealand.[18]


In a clinical trial with clomipramine and placebo as active comparators, adrafinil showed efficacy in the treatment of depression.[3] In contrast to clomipramine however, adrafinil was well-tolerated, and showed greater improvement in psychomotor retardation in comparison.[3] As such, "further investigations of the antidepressive effects of adrafinil are warranted."[3]
Adrafinil (CAS NO.63547-13-7) was discovered in the late 1970s by scientists working with the French pharmaceutical company Group Lafon. First offered in France in 1986 as an experimental treatment for narcolepsy, Lafon later developed modafinil, the primary metabolite of adrafinil. Modafinil possesses greater selective alpha-1 adrenergic activity than adrafinil without the side effects of stomach pain, skin irritations, feelings of tension, and increases in liver enzyme levels.
It is important to monitor the liver of an individual using adrafinil. It can cause liver damage in some instances.
The Adrafinil with CAS registry number of 63547-13-7 is also known as 2-[(Diphenylmethyl)sulfinyl]-N-hydroxyacetamide. The IUPAC name is 2-Benzhydrylsulfinyl-N-hydroxyacetamide. It belongs to product categories of Aromatics Compounds; Aromatics; Intermediates & Fine Chemicals; Pharmaceuticals; Sulfur & Selenium Compounds. This chemical is a light pink solid and its EINECS registry number is 264-303-1. In addition, the formula is C15H15NO3S and the molecular weight is 289.35. This chemical is harmful if swallowed.
Physical properties about Adrafinil are: (1)ACD/LogP: 1.596; (2)ACD/LogD (pH 5.5): 1.60; (3)ACD/LogD (pH 7.4): 1.53; (4)ACD/BCF (pH 5.5): 9.60; (5)ACD/BCF (pH 7.4): 8.34; (6)ACD/KOC (pH 5.5): 175.52; (7)ACD/KOC (pH 7.4): 152.63; (8)#H bond acceptors: 4; (9)#H bond donors: 2; (10)#Freely Rotating Bonds: 6; (11)Index of Refraction: 1.653; (12)Molar Refractivity: 78.858 cm3; (13)Molar Volume: 215.542 cm3; (14)Polarizability: 31.262 10-24cm3; (15)Surface Tension: 67.25 dyne/cm; (16)Density: 1.342 g/cm3
Preparation of Adrafinil: it is prepared by reaction of diphenyl methyl bromide with thiourea. This reaction needs reagent NaOH. After reacting with chloroacetic acid, hydrochloric acid amine and hydrogen peroxide, the product is obtained. The yield is about 73%.
Adrafinil is prepared by reaction of diphenyl methyl bromide with thiourea.
Uses of Adrafinil: it is used as non-amphetamine-type psychostimulant and can wake up and raise awareness. For the elderly arousal disorder and depressive symptoms in symptomatic treatment.
Image result for ADRAFINIL


Benzhydrylsulphinyl-acetohydroxamic Acid (Adrafinil)1

15.2 g (0.2 mol) of thiourea and 150 ml of demineralized water are introduced into a 500 ml three-neck flask equipped with a central mechanical stirrer, and with a dropping funnel and a condenser on the (respective) side-necks.The temperature of the reaction mixture is brought to 50°and 49.4g (0.2 mol) of bromodiphenyl- methane are added all at once whilst continuing the heating. After refluxing for about 5 minutes, the solution, which has become limpid, is cooled to 20°C and 200 ml of 2.5 N NaOH are then added dropwise whilst maintaining the said temperature. The temperature is then again kept at the reflex for 30 minutes after which, when the mixture has returned to ordinary temperature (15-25°C), the aqueous solution is acidified with 45 ml of concentrated hydrochloric acid. The supernatant oil is extracted with 250 ml of diethyl ether and the organic phase is washed with 4x80 ml of water and then dried over magnesium sulphate. 39 g of crude diphenylmethane-thiol are thus obtained. Yield 97.5%.
Benzhydryl-thioacetic acid
10 g (0.05 mol) of diphenylmethane-thiol and 2g (0.05 mol) of NaOH dissolved in 60 ml of demineralised water are introduced successively into a 250 ml flask equipped with a magnetic stirrer and a reflux condenser. The reactants are left in contact for 10 minutes whilst stirring, and a solution consisting of 7g (0.075 mol) of chloroacetic acid, 3g (0.075 mol) of NaOH pellets and 60 ml of demineralized water is then added all at once. The aqueous solution is gently warmed to about 50°C for 15 minutes, washed with 50 ml of ether, decanted and acidified with concentrated hydrochloric acid. after filtration, 10.2g of benzhydryl-thioacetic acid are thus obtained. Melting point 129-130°C. Yield 79%.
Ethyl benzhydryl-thioacetate
The following reaction mixture is heated under reflux for 7 hours: 10.2 g (0.0395 mol) of benzhydryl-thioacetic acid, 100 ml of anhydrous ethanol and 2 ml of sulphuric acid. When heating has been completed, the ethanol isevaporated in vacuo; the oily residue is taken up in 100 ml of ethyl ether and the organic solution is then washed with water, with an aqueous sodium carbonate solution and then with water until the wash waters have a neutral pH. After drying over sodium sulphate, the solvent is evaporated. 10.5g of ethyl benzhydryl- thioacetate are thus obtained. Yield 93%.
Benzhydryl-thioacetohydroxamic acid
The following three solutions are prepared:
  1. Ethyl Benzhydryl-thioacetate 10.8 g (0.0378 mol) in 40 ml methanol
  2. Hydroxylamine hydrochloride 5.25 g (0.0756 mol) in 40 ml methanol
  3. Potassium Hydroxide pellets 7.3 g (0.0134 mol) in 40 ml methanol
The solutions are heated, if necessary, until they become limpid, and when the temperatures have again fallen to below 40°C, the solution of potassium hydroxide in methanol is poured into the solution of hydroxylamine hydrochloride in alcohol. Finally, at a temperature of about 5° to 10°C, the solution of ethyl benzhydryl- thioacetate is added in its turn. After leaving the reactants in contact for 10 minutes, the sodium chloride is filtered off the limpid solution obtained is kept for about 15 hours at ordinary temperature. The methanol is then evaporated under reduced pressure, the residual oil is taken up in 100 ml of water and the aqueous solution is acidified with 3 N hydrochloric acid. The hydroxamic acid which has crystallized is filtered off, washed with water and then dried. 9.1 g of product are obtained. Yield = 87.5%. Melting point 118-120°C.

Adrafinil (CRL 40,028)

10.4g (0.038 mol) of benzhydryl-thioacetohydroxamic acid are oxidized at 40°C, over the course of 2 hours, by means of 3.8 ml (0.038 mol) of hydrogen peroxide of 110 volumes strength (33%), in 100 ml of acetic acid.
When the oxidation has ended, the acetic acid is evaporated under reduced pressure and the residual oil is taken up in 60 ml of ethyl acetate. The product which has crystallized is filtered off and then purified by recrystallisation from a 3:2 (by volume) mixture of ethyl acetate and isopropyl alcohol.
8g (73%) of Adrafinil, mp 159-160°C, are thus obtained. H2O Solubility <1 g/L.

Image result for adrafinil nmr
Figure 2: GC/MS extracted ion chromatogram (a) and mass spectrum (b) of derivatized adrafinil in the electron ionization mode (monitoring the m/z 167, 165 and 152 ions; all the four peaks are derivatised adrafinil products).
Figure 4: LC/ESI-MS full scan chromatogram of adrafinil and its metabolites (a) (modafinil acid RT 3.8 min, adrafinil RT 4.0 min, modafinil RT 4.1 min), and LC/ESI-MS full scan mass spectra of modafinil acid (b), adrafinil (c), and (d) modafinil. (b, c and d showing the similar ions at m/z 167, 165, 152 together with the appropriate sodium and potassium adducts).
Image result for adrafinil nmr

FIG. 1 shows the structure of adrafinil and its metabolites.
FIG. 2 shows the chemical synthesis of adrafinil.
Image result for adrafinil nmr


  1. Jump up^ Robertson P, Hellriegel ET (2003). "Clinical pharmacokinetic profile of modafinil". Clin Pharmacokinet42 (2): 123–37. doi:10.2165/00003088-200342020-00002.PMID 12537513.
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External links

Clinical data
Trade namesOlmifon
AHFS/Drugs.comInternational Drug Names
Routes of administrationOral
ATC codeN06BX17 (WHO)
Legal status
Legal status
  • US: Unscheduled
Pharmacokinetic data
Metabolism75% (Liver)
Biological half-life1 hour (T1/2 is 12–15 hours for modafinil)[1]
Systematic (IUPAC) name: (±)-2-Benzhydrylsulfinylethanehydroxamic acid
CAS Number63547-13-7 
PubChem (CID)3033226
ChemSpider2297976 Yes
UNIIBI81Z4542G Yes
KEGGD07348 Yes
Chemical and physical data
Molar mass289.351 g/mol
3D model (Jmol)Interactive image