[OH:1][C:2]1([CH:5]2[CH2:9][CH:8]([O:10][CH3:11])[CH2:7][N:6]2[C:12]([O:14][CH2:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)=[O:13])[CH2:4][CH2:3]1.[CH3:22]I.[H-].[Na+]>C1COCC1>[CH3:11][O:10][CH:8]1[CH2:7][N:6]([C:12]([O:14][CH2:15][C:16]2[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=2)=[O:13])[CH:5]([C:2]2([O:1][CH3:22])[CH2:3][CH2:4]2)[CH2:9]1To a mixture of benzyl 2-(1-hydroxycyclopropyl)-4-methoxypyrrolidine-1-carboxylate (312 mg, 1.07 mmol) dissolved in THF (3.6 mL) at 0° C. was added methyl iodide (0.23 mL, 3.68 mmol) followed by sodium hydride (56.5 mg, 2.36 mmol). The mixture was stirred for 2 hours at room temperature. The reaction was quenched with ice, and diluted with diethyl ether. The organic layer was washed with water and brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography (0-20% methanol/dichloromethane, linear gradient) to afford benzyl 4-methoxy-2-(1-methoxycyclopropyl)pyrrolidine-1-carboxylate. MS ESI calc'd. for C17H23NO4 [M+H]+ 306. found 306.
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