102781-19-1

Basic information

• Product Name: 4-Imino-9-methyl-4H-pyrido[1,2-a]pyrimidine-3-carbonitrile
• Synonyms: 4-Imino-9-methyl-4H-pyrido[1,2-a]pyrimidine-3-carbonitrile
• CAS NO: 102781-19-1
• Molecular Formula: C10H8N4
• Molecular Weight: 184.2
• Mol File: 102781-19-1.mol

Chemical Properties

• Melting Point: 164-166 °C(Solv: ethanol (64-17-5))
• Boiling Point: 295.9±43.0 °C(Predicted)
• Appearance: /
• Density: 1.27±0.1 g/cm3(Predicted)
• PKA: 4.10±0.60(Predicted)
• CAS DataBase Reference: 4-Imino-9-methyl-4H-pyrido[1,2-a]pyrimidine-3-carbonitrile(CAS DataBase Reference)
• NIST Chemistry Reference: 4-Imino-9-methyl-4H-pyrido[1,2-a]pyrimidine-3-carbonitrile(102781-19-1)
• EPA Substance Registry System: 4-Imino-9-methyl-4H-pyrido[1,2-a]pyrimidine-3-carbonitrile(102781-19-1)

Safety Data

• Hazardous Substances Data: 102781-19-1(Hazardous Substances Data)

Upstream product

• 1603-40-3 3-methylpyridin-2-ylamine 
• 123-06-8 Ethoxymethylenemalononitrile 

Downstream Products

• 132056-88-3 4-imino-9-methyl-3-(1H-tetrazol-5-yl)-4H-pyrido<1,2-a>pyrimidine 
• 69372-19-6 pemirolast 

Relevant articles and documents

Process for producing 3-tetrazolyl pyrido[1,2-a]pyrimidine derivatives

3-Tetrazolylpyrido[1,2-a]pyrimidin-4-one derivatives useful as an antiallergy agent are produced by reacting a cyano derivative of pyrido[1,2-a]pyrimidin-4-one compound with (i) hydrazoic acid, followed by hydrolysis, or with (ii) a salt of hydrazoic acid

Nitrogen Bridgehead Compounds. 63. Ring-Chain Tautomerism of malonitriles

Twenty-one α-amino aza heterocycles were reacted with (ethoxymethylene)malonitrile.UV and 1H and 13C NMR studies indicated that in solution the structures of the condensation products can be described as chain and ring tautomers.Investigations were also made of the solvent and temperature dependence of the position of equilibrium of the ring and chain tautomer forms and the effect of protonation on the ring-chain tautomerism of the 2-aminopyridine derivative.The proportion of the ring form is increased by the presence of a substituent in position 2 of the pyridopyrimidine skeleton type ring tautomer and also by electron-donating substituents in position 7 or 8, while electron-accepting groups increase the content of the chain tautomer.A substituent in position 6 sterically favors the chain form, while substituent in position 9 influences the equilibrium between the ring and chain tautomer forms through its electronic and steric properties and its hydrogen bond forming ability.The 1-aminoisoquinoline derivative is present in ring form in both CDCl3 and Me2SO-d6.The derivatives of 2-aminoquinoline, 3-aminoisoquinoline, 2-aminopyrimidine, and 2-aminopyrazine predominantly exist as chain tautomers.The derivatives of ?-excess five-membered heterocycles - of 2-aminothiazole, 3-aminopyrazole, 2-aminobenzthiazole, and 2-aminobenzimidazoles - favor the ring form.In the case of 3-aminopyrazole, the chain and ring forms could be seperated.