How is Ethyl {5-[(4-methylphenyl)sulfonyl]-5H-pyrrolo[2,3-b]pyrazin-2-yl}carbamate (CAS: 1869118-24-0) typically synthesized?

Ethyl {5-[(4-methylphenyl)sulfonyl]-5H-pyrrolo[2,3-b]pyrazin-2-yl}carbamate can be synthesized through a multistep process involving the synthesis of the pyrazinone derivative, followed by alkylation with ethyl isothiocyanate. The reaction involves the use of a suitable base such as potassium carbonate and is typically conducted in an aprotic solvent like dimethylformamide (DMF) at room temperature. The final product is obtained through hydrolysis of the resulting isothiocyanate ester.