Benzylamine → (7R,8aS)-2-benzyl-7-hydroxyhexahydropyrrolo[1,2-a]pyrazine-1,4-dione

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Reaction Steps

To a solution of Example 54B (75 g, 0.34 mol, 1 equivalent) in 2-ethoxyethanol (1.2 L), benzylamine (44 mL, 0.41 mol, 1.2 equivalents) was added. Triethylamine (60 mL, 0.43 mol, 1.28 equivalents) was then added, and the resultant mixture was refluxed for 12 hours. The reaction mixture was cooled and concentrated under reduced pressure. This crude material was purified by column chromatography on silica gel using a gradient of methanol-ethyl acetate to provide the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.93-2.03 (m, 1H), 2.1-2.17 (m, 1H), 3.23 (d, 1H, J=12.3 Hz), 3.55 (d, 1H, J=4.2 Hz), 3.63 (d, 1H, J=16.5 Hz), 4.15 (m, 1H), 4.32 (bs, 1H), 4.47-4.59 (m, 3H), 5.16 (s, 1H), 7.24-7.37 (m, 5H).

Provenance & Evidence