ChemicalBook > CAS DataBase List > 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

Product Name
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
CAS No.
63234-80-0
Chemical Name
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
Synonyms
3-(2-Chloroethyl)-6;Risperidone Impurity L;Paliperidone Impurity 26;Risperidone EP IMpurity L;Risperidone Chloro IMpurity;Risperidone Intermediate III;3-(2-Chloro-ethyl)-2-methyl-6,7,8,9-tetrahydro-;Risperidone Impurity 12(Risperidone EP Impurity L);-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one;Risperidone EP Impurity L (Risperidone Chloroethyl Impurity)
CBNumber
CB0359227
Molecular Formula
C11H15ClN2O
Formula Weight
226.7
MOL File
63234-80-0.mol
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3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one Property

Melting point:
68.5-69.5 °C
Boiling point:
337 °C
Density 
1.30
Flash point:
157 °C
storage temp. 
Sealed in dry,Room Temperature
solubility 
Chloroform (Slightly), Methanol (Slightly)
form 
Solid
pka
3.58±0.70(Predicted)
color 
White to Off-White
InChI
InChI=1S/C11H15ClN2O/c1-8-9(5-6-12)11(15)14-7-3-2-4-10(14)13-8/h2-7H2,1H3
InChIKey
CMWCQQUYLPYOMY-UHFFFAOYSA-N
SMILES
C12CCCCN1C(=O)C(CCCl)=C(C)N=2
CAS DataBase Reference
63234-80-0(CAS DataBase Reference)
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Safety

Hazard Codes 
T
Risk Statements 
25
Safety Statements 
45
RIDADR 
UN3261
HS Code 
2933.99.9701
HazardClass 
IRRITANT
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

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N-Bromosuccinimide Price

TCI Chemical
Product number
C2433
Product name
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
Purity
>98.0%(GC)(T)
Packaging
5g
Price
$112
Updated
2025/07/31
TCI Chemical
Product number
C2433
Product name
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
Purity
>98.0%(GC)(T)
Packaging
25g
Price
$337
Updated
2025/07/31
TRC
Product number
C366155
Product name
3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
Packaging
5g
Price
$245
Updated
2021/12/16
Biosynth Carbosynth
Product number
FC20229
Product name
3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
Packaging
250g
Price
$625
Updated
2021/12/16
American Custom Chemicals Corporation
Product number
HCH0020290
Product name
3-(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRIDO [1,2-A] PYRIMIDINE-4-ONE
Purity
95.00%
Packaging
1G
Price
$739.2
Updated
2021/12/16
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3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one Chemical Properties,Usage,Production

Chemical Properties

White Solid

Uses

3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (Risperidone EP Impurity L) is an intermediate in the synthesis of Risperidone (R525000), which is a combined serotonin (5-HT2) and dopamine (D2) receptor antagonist.

Synthesis

41078-70-0

63234-80-0

The general procedure for the synthesis of 3-(2-chloroethyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one from 3-(2-chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one is as follows: 28 g of 3-(2-chloroethyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one obtained in step A) was dissolved in 90 mL 6N hydrochloric acid. -a]pyrimidin-4-one was dissolved in 90 mL of 6N hydrochloric acid, followed by the addition of 2.8 g of 10% palladium carbon catalyst to the solution. The reaction mixture was subjected to 35 psi hydrogen pressure and hydrogenated at room temperature with stirring for 8 hours. Upon completion of the reaction, the mixture was filtered through diatomaceous earth (Cellite) to remove the catalyst. The filtrate was concentrated under reduced pressure to give a residue. To the residue was added 200 mL of isopropanol and the mixture was stirred. The precipitated solid was collected by filtration and dried to give 25.1 g of the target product 3-(2-chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one as white crystals in 90% yield.

References

[1] Patent: WO2004/35573, 2004, A1. Location in patent: Page 9
[2] Journal of the American Chemical Society, 2017, vol. 139, # 24, p. 8267 - 8276
[3] Letters in Drug Design and Discovery, 2011, vol. 8, # 10, p. 988 - 995
[4] Medicinal Chemistry, 2013, vol. 9, # 2, p. 240 - 248

3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one Preparation Products And Raw materials

Raw materials

Ammonium hydroxide Palladium hydroxide Toluene Phosphorus oxitrichloride Ethyl acetate Hydrochloric acid Hydrogen Dichloromethane 2-Acetylbutyrolactone 2-Aminopyridine Isopropyl alcohol PETROLEUM ETHER

Preparation Products

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3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one Suppliers

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View Lastest Price from 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one manufacturers

Shaanxi Dideu Medichem Co. Ltd
Product
3-(2-Chloroethyl)-2-Methyl-6,7,8,9-Tetrahydro-4H-Pyrido[1,2-a]-Pyrimidin-4-One 63234-80-0
Price
US $21.00/g
Min. Order
1g
Purity
99.0% min
Supply Ability
100 tons min
Release date
2021-04-30
Sach biotech Co.,Ltd
Product
3-2-(chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pirido[1,2-a]pirimidin-4-one 63234-80-0
Price
US $300.00-155.00/kg
Min. Order
1kg
Purity
98%
Supply Ability
500kgs/month
Release date
2024-07-10
Shaanxi Haibo Biotechnology Co., Ltd
Product
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one 63234-80-0
Price
US $0.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
2000ton
Release date
2023-08-31

63234-80-0, 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-oneRelated Search:

Methyl 2-hydroxyethyl cellulose Methyl acrylate 2,6-Lutidine Azamethiphos 4-Methylpyridine METHYL THIOPHENE-2-CARBOXYLATE Methyl acetate 2-Chloro-5-chloromethylpyridine Kresoxim-methyl Bensulfuron methyl Pirimiphos-methyl Methylparaben Thiophanate-methyl Methyl 2,4-Difluorobenzoyl Risperidone IMpurity Desfluoro Risperidone Risperidone Pyrimidinone-N-oxide 6-Fluoro-3-[1-bis-[2-(methyl-6,7,8,9-tetrahydropyridol[1,2,a]pyrimidin-4-one-3-yl)ethyl]piperidinium]benzisoxazole Iodide

  • 3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]-pyrididine-4-one (intermediate of Risperidone)
  • 3-(2-CHLOROETHYL)-2-METHYL-6,7,8,9-TETRAHYDRO-4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE
  • 3-(2-CHLORO-ETHYL)-2-METHYL-6,7,8,9-TETRAHYDRO-PYRIDO[1,2-A]PYRIMIDIN-4-ONE
  • 3-(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRIDINO[1,2-A]PYRIMIDINE-4-ONE
  • 3-(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRIDO(1,2A)PYRIMIDINE-4-ONE
  • 3-(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRLDO[1,2-A]PYRIMDIN-4-ONE
  • 3-2(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-alpha]pyrimnidin-4-one
  • 3-2(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRIDO[1,2-A]PYRIMDIN-4-ONE
  • 8-(CHLOROETHYL)-9-METHYL-6,10-DIAZABICYCLO[4.4.0]DECA-8,10-DIEN-7-ONE
  • 3-(2-CHLOROETHYL)-2-METHYL-6,7,8,9-TETRAHYDRO-4H-PYRIDO[1,2-ALPHA]PYRIMIDIN-4-ONE
  • 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2<br>-a]pyrimidin-4-one
  • 3-(2-Chloroethyl)-2-Methyl-6,7,8,9-tetrahydro-4H-pyrimidine-4-one
  • 3-(2-CHLOROETHYL)-2-METHYL-6,7,8,9-TETRAHYDRO-4H-PYRIDO[1, 2-A]-PYRIMIDIN-4-ONE ( RISPERIDONE INTERMEDIATE ).
  • 3-(2-CHLOROETHYL)-6,7,8,9-TETRAHYDRO-2-METHYL-4H-PYRIDO[1,2-A]-PYRIMIDIN-4-ONE(RISPERIDONEINTERMEDIATE)
  • 3-(2-CHLOROETHYL)-2-METHYL-6,7,8,9-TETRAHYDRO-4H-PYRIDO[1,2-A]-PYRIDIDINE-4-ONE
  • 3-(2-chloroethyl)-2-methyl-4H,6H,7H,8H,9H-pyrido[1,2-a]pyrimidin-4-one
  • Risperidone Intermediate III
  • 3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-α]pyrimidin-4-one
  • 3-(2-Chloro-ethyl)-2-methyl-6,7,8,9-tetrahydro-
  • 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
  • 4H-Pyrido[1,2-a]pyrimidin-4-one, 3-(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl-
  • 3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]-pyrimidin-4-one ,98%
  • 3-(2-Chloroethyl)-6
  • 3-(2-chloroethyl)-2-Methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]py
  • Phenyl(4-piperidyl)Methanone3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-Methyl-4H-pyrido[1,2-a]pyriMidin-4-one
  • Risperidone Chloro IMpurity
  • Risperidone EP IMpurity L
  • 3-(2-chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4Hpyrido[1,2-a]pyrimidin-4-one (piperidopyrimidinone intermediate)
  • Paliperidone Impurity 26
  • Risperidone Impurity 12(Risperidone EP Impurity L)
  • 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one &gt
  • -6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
  • Risperidone Impurity L
  • 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one ISO 9001：2015 REACH
  • Risperidone EP Impurity L (Risperidone Chloroethyl Impurity)
  • 3-(2-Chloroethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-...
  • TIANFU-CHEM - 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one, ≥ 98.0%
  • 3-2-(chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pirido[1,2-a]pirimidin-4-one
  • 3-(2-Chloro)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-(2-Chloroethyl)-6,7,8,9-TH-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-(2-Chloroethyl)-2-Methyl-6,7,8,9-Tetrohydro-4H-Pyridol[1,2-a]-Pyrimidin-4-One
  • 63234-80-0
  • 63274-80-0
  • 62234-80-0
  • 63274-80-0
  • C11H15ClN2O
  • Bases & Related Reagents
  • Intermediates & Fine Chemicals
  • Nucleotides
  • Pharmaceuticals
  • Intermediates
  • Nucleotides and Nucleosides
  • (intermediate of Risperidone)