[ CAS No. 5157-08-4 ] {[proInfo.proName]}

Name: 5157-08-4|6-Methyl-4,5-dihydropyridazin-3(2H)-one|97%
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SKU: A127809
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3d Animation Molecule Structure of 5157-08-4

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Quality Control of [ 5157-08-4 ]

COA NMR CNMR HPLC LC-MS

Related Doc. of [ 5157-08-4 ]

SDS Specification

Alternatived Products of [ 5157-08-4 ]

Product Details of [ 5157-08-4 ]

CAS No. :	5157-08-4	MDL No. :	MFCD00006455
Formula :	C₅H₈N₂O	Boiling Point :	-
Linear Structure Formula :	-	InChI Key :	VOTFXESXPPEARL-UHFFFAOYSA-N
M.W :	112.13	Pubchem ID :	78834
Synonyms :

Calculated chemistry of [ 5157-08-4 ]

Physicochemical Properties

Num. heavy atoms :	8
Num. arom. heavy atoms :	0
Fraction Csp3 :	0.6
Num. rotatable bonds :	0
Num. H-bond acceptors :	2.0
Num. H-bond donors :	1.0
Molar Refractivity :	37.96
TPSA :	41.46 Å²

Pharmacokinetics

GI absorption :	High
BBB permeant :	No
P-gp substrate :	No
CYP1A2 inhibitor :	No
CYP2C19 inhibitor :	No
CYP2C9 inhibitor :	No
CYP2D6 inhibitor :	No
CYP3A4 inhibitor :	No
Log Kp (skin permeation) :	-7.5 cm/s

Lipophilicity

Log Po/w (iLOGP) :	1.16
Log Po/w (XLOGP3) :	-0.73
Log Po/w (WLOGP) :	-0.49
Log Po/w (MLOGP) :	-0.08
Log Po/w (SILICOS-IT) :	1.48
Consensus Log Po/w :	0.27

Druglikeness

Lipinski :	0.0
Ghose :	None
Veber :	0.0
Egan :	0.0
Muegge :	1.0
Bioavailability Score :	0.55

Water Solubility

Log S (ESOL) :	-0.08
Solubility :	94.3 mg/ml ; 0.841 mol/l
Class :	Very soluble
Log S (Ali) :	0.34
Solubility :	243.0 mg/ml ; 2.17 mol/l
Class :	Highly soluble
Log S (SILICOS-IT) :	-1.29
Solubility :	5.75 mg/ml ; 0.0513 mol/l
Class :	Soluble

Medicinal Chemistry

PAINS :	0.0 alert
Brenk :	0.0 alert
Leadlikeness :	1.0
Synthetic accessibility :	2.55

Safety of [ 5157-08-4 ]

Signal Word:	Warning	Class:	N/A
Precautionary Statements:	P261-P305+P351+P338	UN#:	N/A
Hazard Statements:	H315-H319-H335	Packing Group:	N/A
GHS Pictogram:

Application In Synthesis of [ 5157-08-4 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

Upstream synthesis route of [ 5157-08-4 ]
Downstream synthetic route of [ 5157-08-4 ]

[ 5157-08-4 ] Synthesis Path-Upstream 1~2

1
[ 5157-08-4 ]
[ 65202-58-6 ]

Reference： [1] Patent: EP3333157, 2018, A1,

2
[ 5157-08-4 ]
[ 13327-27-0 ]

Yield	Reaction Conditions	Operation in experiment
68%	at 90℃; for 6 h;	To a solution of 6-methyl-4,5-dihydropyridazin-3(2H)-one (9.0 g, 80.26 mmol) in acetic acid (90 mL) was dropwise added bromine (7.68 g, 48.05 mmol) at 90 °C and the reaction mixture was stirred at 90 °C for 5-6 h. The excess of acetic acid was removed and the resultant residue was treated with an aqueous solution of sodium bicarbonate, filtered and the filter cake was dried to afford the title product (6.0 g, 68percent). ¹H NMR (300 MHz, DMSO-d₆): δ 12.73 (s, 1H), 7.30 (d, J = 9.6 Hz, 1H), 6.80 (d, J = 9.9 Hz, 1H), 2.14 (s, 3H).
20 g	at 80℃; for 0.5 h;	Example 13A (23g, 205.4mmol) was dissolved in acetic acid (100mL) and liquid bromine (55.03g, 348.5mmol)was added dropwise to the above solution under vigorous stirring. The temperature during the dropwise addition did notexceed 40°C. After the addition, the mixture was reacted at 80°C for half an hour, cooled to room temperature, filteredand the filter cake was rinsed twice with methyl tert-butyl ether to give the title compound (20g, yield 87percent) which wasused directly in the next step without further purification. LCMS (ESI) m/z: 133[M+1]+. 1HNMR (CHLOROFORM-d, BrukerAvance 400MHz): ppm 7.36-7.39 (m, 1H), 6.69-6.89 (m, 1H), 2.22 (s, 3H).

Reference： [1] Bioorganic and Medicinal Chemistry Letters, 2012, vol. 22, # 19, p. 6286 - 6291
[2] Journal of Chemical Research, Miniprint, 1995, # 8, p. 1840 - 1852
[3] Journal of the Chemical Society, 1947, p. 239,242
[4] Journal of the Chemical Society, 1947, p. 239,242
[5] Patent: US4595521, 1986, A,
[6] Patent: US4255571, 1981, A,
[7] European Journal of Medicinal Chemistry, 2013, vol. 64, p. 512 - 528
[8] Patent: EP3333157, 2018, A1, . Location in patent: Paragraph 0134; 0135

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[ 5157-08-4 ]

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[ 5157-08-4 ]

Pyridazines

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Ghs Precautionary Statements

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P202	Do not handle until all safety precautions have been read and understood.
P210	Keep away from heat/sparks/open flames/hot surfaces. - No smoking.
P211	Do not spray on an open flame or other ignition source.
P220	Keep/Store away from clothing/combustible materials.
P221	Take any precaution to avoid mixing with combustibles
P222	Do not allow contact with air.
P223	Keep away from any possible contact with water, because of violent reaction and possible flash fire.
P230	Keep wetted
P231	Handle under inert gas.
P232	Protect from moisture.
P233	Keep container tightly closed.
P234	Keep only in original container.
P235	Keep cool
P240	Ground/bond container and receiving equipment.
P241	Use explosion-proof electrical/ventilating/lighting/equipment.
P242	Use only non-sparking tools.
P243	Take precautionary measures against static discharge.
P244	Keep reduction valves free from grease and oil.
P250	Do not subject to grinding/shock/friction.
P251	Pressurized container: Do not pierce or burn, even after use.
P260	Do not breathe dust/fume/gas/mist/vapours/spray.
P261	Avoid breathing dust/fume/gas/mist/vapours/spray.
P262	Do not get in eyes, on skin, or on clothing.
P263	Avoid contact during pregnancy/while nursing.
P264	Wash hands thoroughly after handling.
P265	Wash skin thouroughly after handling.
P270	Do not eat, drink or smoke when using this product.
P271	Use only outdoors or in a well-ventilated area.
P272	Contaminated work clothing should not be allowed out of the workplace.
P273	Avoid release to the environment.
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P281	Use personal protective equipment as required.
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P285	In case of inadequate ventilation wear respiratory protection.
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P235 + P410	Keep cool. Protect from sunlight.
Response
Code	Phrase
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P304	IF INHALED:
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P311	Call a POISON CENTER or doctor/physician.
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P313	Get medical advice/attention.
P314	Get medical advice/attention if you feel unwell.
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P320
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P321
P322
P330	Rinse mouth.
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P342	If experiencing respiratory symptoms:
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P352	Wash with plenty of soap and water.
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P361	Remove/Take off immediately all contaminated clothing.
P362	Take off contaminated clothing and wash before reuse.
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P370	In case of fire:
P371	In case of major fire and large quantities:
P372	Explosion risk in case of fire.
P373	DO NOT fight fire when fire reaches explosives.
P374	Fight fire with normal precautions from a reasonable distance.
P376	Stop leak if safe to do so. Oxidising gases (section 2.4) 1
P377	Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P378
P380	Evacuate area.
P381	Eliminate all ignition sources if safe to do so.
P390	Absorb spillage to prevent material damage.
P391	Collect spillage. Hazardous to the aquatic environment
P301 + P310	IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P301 + P312	IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
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P302 + P350	IF ON SKIN: Gently wash with plenty of soap and water.
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P304 + P312	IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell.
P304 + P340	IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P304 + P341	IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
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P332 + P313	IF SKIN irritation occurs: Get medical advice/attention.
P333 + P313	IF SKIN irritation or rash occurs: Get medical advice/attention.
P335 + P334	Brush off loose particles from skin. Immerse in cool water/wrap in wet bandages.
P337 + P313	IF eye irritation persists: Get medical advice/attention.
P342 + P311	IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician.
P370 + P376	In case of fire: Stop leak if safe to Do so.
P370 + P378	In case of fire:
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P370 + P380 + P375	In case of fire: Evacuate area. Fight fire remotely due to the risk of explosion.
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P401
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Yield	Reaction Conditions	Operation in experiment
57%	With potassium hydroxide; In ethanol; for 18h;Heating / reflux;	Preparation 1-3) [138] 4-(2-tert-Butyl-benzyl)-6-methyl-2H-pyridazin-3-one; [139] To the compound of Preparation 1-2) (324mg, 2.0mmol) were added6-methyl-4,5-dihydro-2H-pyridazin-3-one (Aldrich, 224mg, l.Oeq), KOH (168mg, 3.0eq) and EtOH (10 mNo. ), and the mixture was heated under reflux for 18 h. The reaction mixture was neutralized by IN aqueous hydrochloric acid solution (3.0 mNo. ), and distilled under reduced pressure. The residue was dissolved in excess ethyl acetate (50 mNo. ), washed with aqueous sodium chloride solution, dried (anhydrous Na SO ),2 4 and concentrated under reduced pressure. The residue was purified by column chromatography (50% ethyl acetate-hexane) to give the title compound (292mg, Yield 57%). [140] ' H-NMR (500MHz, CDCl ) delta 12.66(br s, IH), 7.48(d, IH), 7.26-7.20(m, 2H),37.02(d, IH), 6.40(s, IH), 4.22(s, 2H), 2.19(s, 3H), 1.34(s, 9H)
57%		Preparation 1-3; 4-(2-tert-Butyl-benzyl)-6-methyl-2H-pyridazin-3-oneTo the compound of Preparation 1-2) (324 mg, 2.0 mmol) were added 6-methyl-4,5-dihydro-2H-pyridazin-3-one (Aldrich, 224 mg, 1.0 eq), KOH (168 mg, 3.0 eq) and EtOH (10 ml), and the mixture was heated under reflux for 18 h. The reaction mixture was neutralized by 1N aqueous hydrochloric acid solution (3.0 ml), and distilled under reduced pressure. The residue was dissolved in excess ethyl acetate (50 ml), washed with aqueous sodium chloride solution, dried (anhydrous Na2SO4), and concentrated under reduced pressure. The residue was purified by column chromatography (50% ethyl acetate-hexane) to give the title compound (292 mg, Yield 57%).1H-NMR (500 MHz, CDCl3) delta 12.66 (br s, 1H), 7.48 (d, 1H), 7.26-7.20 (m, 2H), 7.02 (d, 1H), 6.40 (s, 1H), 4.22 (s, 2H), 2.19 (s, 3H), 1.34 (s, 9H)

Physical hazards
Code	Phrase
H200	Unstable explosive
H201	Explosive; mass explosion hazard
H202	Explosive; severe projection hazard
H203	Explosive; fire, blast or projection hazard
H204	Fire or projection hazard
H205	May mass explode in fire
H220	Extremely flammable gas
H221	Flammable gas
H222	Extremely flammable aerosol
H223	Flammable aerosol
H224	Extremely flammable liquid and vapour
H225	Highly flammable liquid and vapour
H226	Flammable liquid and vapour
H227	Combustible liquid
H228	Flammable solid
H229	Pressurized container: may burst if heated
H230	May react explosively even in the absence of air
H231	May react explosively even in the absence of air at elevated pressure and/or temperature
H240	Heating may cause an explosion
H241	Heating may cause a fire or explosion
H242	Heating may cause a fire
H250	Catches fire spontaneously if exposed to air
H251	Self-heating; may catch fire
H252	Self-heating in large quantities; may catch fire
H260	In contact with water releases flammable gases which may ignite spontaneously
H261	In contact with water releases flammable gas
H270	May cause or intensify fire; oxidizer
H271	May cause fire or explosion; strong oxidizer
H272	May intensify fire; oxidizer
H280	Contains gas under pressure; may explode if heated
H281	Contains refrigerated gas; may cause cryogenic burns or injury
H290	May be corrosive to metals
Health hazards
Code	Phrase
H300	Fatal if swallowed
H301	Toxic if swallowed
H302	Harmful if swallowed
H303	May be harmful if swallowed
H304	May be fatal if swallowed and enters airways
H305	May be harmful if swallowed and enters airways
H310	Fatal in contact with skin
H311	Toxic in contact with skin
H312	Harmful in contact with skin
H313	May be harmful in contact with skin
H314	Causes severe skin burns and eye damage
H315	Causes skin irritation
H316	Causes mild skin irritation
H317	May cause an allergic skin reaction
H318	Causes serious eye damage
H319	Causes serious eye irritation
H320	Causes eye irritation
H330	Fatal if inhaled
H331	Toxic if inhaled
H332	Harmful if inhaled
H333	May be harmful if inhaled
H334	May cause allergy or asthma symptoms or breathing difficulties if inhaled
H335	May cause respiratory irritation
H336	May cause drowsiness or dizziness
H340	May cause genetic defects
H341	Suspected of causing genetic defects
H350	May cause cancer
H351	Suspected of causing cancer
H360	May damage fertility or the unborn child
H361	Suspected of damaging fertility or the unborn child
H361d	Suspected of damaging the unborn child
H362	May cause harm to breast-fed children
H370	Causes damage to organs
H371	May cause damage to organs
H372	Causes damage to organs through prolonged or repeated exposure
H373	May cause damage to organs through prolonged or repeated exposure
Environmental hazards
Code	Phrase
H400	Very toxic to aquatic life
H401	Toxic to aquatic life
H402	Harmful to aquatic life
H410	Very toxic to aquatic life with long-lasting effects
H411	Toxic to aquatic life with long-lasting effects
H412	Harmful to aquatic life with long-lasting effects
H413	May cause long-lasting harmful effects to aquatic life
H420	Harms public health and the environment by destroying ozone in the upper atmosphere

[ CAS No. 5157-08-4 ] {[proInfo.proName]}

Quality Control of [ 5157-08-4 ]

Related Doc. of [ 5157-08-4 ]

Product Details of [ 5157-08-4 ]

Calculated chemistry of [ 5157-08-4 ]

Physicochemical Properties

Pharmacokinetics

Lipophilicity

Druglikeness

Water Solubility

Medicinal Chemistry

Safety of [ 5157-08-4 ]

Application In Synthesis of [ 5157-08-4 ]

[ 5157-08-4 ] Synthesis Path-Upstream 1~2

[ 5157-08-4 ] Synthesis Path-Downstream 1~88

Related Functional Groups of [ 5157-08-4 ]

Amides

Related Parent Nucleus of [ 5157-08-4 ]

Pyridazines

Precautionary Statements-General

Prevention

Response

Storage

Disposal

Physical hazards

Health hazards

Environmental hazards

Inquiry

Related Functional Groups of
[ 5157-08-4 ]

Related Parent Nucleus of
[ 5157-08-4 ]