Methyl iodide → HCID 66669442, compound

Participants

Reaction Conditions

Reaction Steps

(3S,8aS)-3-({[(1,1-Dimethylethyl)(dimethyl)silyl]oxy}methyl)hexahydropyrrolo[1,2-a]pyrazin-1(2H)-one (1.51 g, 5.32 mmol) in dimethylformamide (8 mL) was added to an ice-cooled suspension of sodium hydride (60 wt. % dispersion in oil; 213 mg, 5.32 mmol) in dimethylformamide (8 mL). The mixture was stirred at 0° C. for 0.25 h and then iodomethane (0.332 mL, 5.32 mmol) was added dropwise. The mixture was stirred at room temperature for 0.5 h and then was stirred at 70° C. for 2 h. The mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The aqueous portion was extracted with ethyl acetate. The combined organic portion was dried over sodium sulfate, filtered and concentrated in vacuo to afford (3S,8aS)-3-({[(1,1-dimethylethyl)(dimethyl)silyl]oxy}methyl)-2-methylhexahydropyrrolo[1,2-a]pyrazin-1(2H)-one as a yellow oil (1.552 g, 5.21 mmol) which was dissolved in tetrahydrofuran (20 mL) and treated with tetrabutylammonium fluoride (1.0M solution in tetrahydrofuran; 10.4 mL, 10.4 mmol) for 2 h at room temperature. The mixture was concentrated in vacuo and purified by column chromatography (10% methanol in dichloromethane) to afford (3S,8aS)-3-(hydroxymethyl)-2-methylhexahydropyrrolo[1,2-a]pyrazin-1(2H)-one as a yellow oil (496 mg, 2.70 mmol, 51% yield from (3S,8aS)-3-({[(1,1-dimethylethyl)(dimethyl)silyl]oxy}methyl)hexahydropyrrolo[1,2-α]pyrazin-1(2H)-one). 1H NMR (400 MHz, CDCl3): 3.98-3.93 (m, 1H), 3.86 (dd, 1H), 3.61-3.55 (m, 1H), 3.29-3.25 (m, 1H), 3.09-3.03 (m, 1H), 3.03-2.97 (m, 1H), 3.02 (s, 3H), 2.93 (dd, 1H), 2.87-2.79 (m, 1H), 2.32-2.21 (m, 1H), 2.00-1.86 (m, 2H), 1.83-1.64 (m, 1H); MS (EI) for C9H16N2O2: 185 (MH+).

Provenance & Evidence