Aminopyrazine → (2S,4S)-Benzyl 4-methoxy-2-(pyrazin-2-ylcarbamoyl)pyrrolidine-1-carboxylate

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Reaction Steps

To a solution of aminopyrazine (535 mg, 5.63 mmol) in THF (15 mL) was added isopropylmagnesium chloride (2.0 M THF solution, 2.7 mL, 5.35 mmol) dropwise at 0° C. The resulting slurry was stirred at room temperature for 30 min. A solution of (2S,4S)-1-benzyl 2-methyl 4-methoxypyrrolidine-1,2-dicarboxylate (550 mg, 1.88 mmol) in THF (2 mL) was added to the slurry. The reaction mixture was stirred at room temperature for 4 h and quenched with methanol (3 mL). The crude product was purified by preparative HPLC to give (2S,4S)-benzyl 4-methoxy-2-(pyrazin-2-ylcarbamoyl)pyrrolidine-1-carboxylate 18C (570 mg, 85%) as an oil. LC/MS [M+H]+: 356; Ret time (Method F): 2.32 min.

Provenance & Evidence