Methyl 4,5-dihydro-5-oxo-2-pyrazinecarboxylate

Preparation 405-Hvdroxy-pyrazine-2-carboxylic acid methyl esterThionyl chloride (152ml_, 2.08mol) was added dropwise at -20 °C to methanol (5L). After the addition was completed, the mixture was stirred at this temperature for 30 minutes. Then 5- hydroxy-pyrazine-2-carboxylic acid (100g, 714mmol) was added, and the mixture was heated at reflux for 2 hours. The reaction mixture was concentrated in vacuo, and the residue was recrystallised from methanol (400ml_) to give 71 g (464mmol) of the title compound in 65percent yield.(62a) Preparation 405-Hvdroxy-pyrazine-2-carboxylic acid methyl esterThionyl chloride (152ml_, 2.08mol) was added dropwise at -20 °C to methanol (5L). After the addition was completed, the mixture was stirred at this temperature for 30 minutes. Then 5- hydroxy-pyrazine-2-carboxylic acid (100g, 714mmol) was added, and the mixture was heated at reflux for 2 hours. The reaction mixture was concentrated in vacuo, and the residue was recrystallised from methanol (400ml_) to give 71 g (464mmol) of the title compound in 65percent yield.(62a)

Molecular Weight:154.12
XLogP3:-0.6
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:2
Exact Mass:154.03784206
Monoisotopic Mass:154.03784206
Topological Polar Surface Area:67.8
Heavy Atom Count:11
Complexity:255
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes