Allyl bromide → Methyl 3-Allyl-1-Boc-pyrrolidine-3-carboxylate

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Pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester 2 (see Example 1, Step 1) (4.58 g, 20 mmol) was dissolved in THF (100 mL) and cooled down to −78° C. in a dry ice-acetone bath. LDA (12 mL, 2.0 M, 24 mmol) was then added dropwise. The mixture was stirred at −78° C. for 1 hr. Allyl bromide (5.3 mL, 61 mmol) was added in neat. The reaction was allowed to warm to rt naturally and stirred for 24 hrs. It was then quenched with sat. NH4Cl solution, extracted with ethyl acetate 2×150 mL. The organic layer was washed with brine, dried (MgSO4) and concentrated. The crude was purified on silica gel column using 4:1 hexanes/ethyl acetate to get the title compound (3.6 g) as a yellow oil. MS (292, MNa).

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