Allyl bromide → HCID 59853567, compound

Participants

Reaction Conditions

Reaction Steps

4,4-Difluoro-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (Example 14b, 6.77 g, 26.96 mmol) was dissolved in a 5% aqueous sodium bicarbonate solution (50 mL). Allyl bromide (3.26 g, 26.96 mmol) and trioctylmethylammonium chloride (“Aliquat 336”, 10.90 g, 26.97 mmol) were dissolved in dichloromethane (50 mL) and were added to the aqueous solution. The biphasic reaction mixture was stirred vigorously for 48 h at 25° C. The layers were separated and the aqueous layer was extracted with dichloromethane (3×70 mL). The combined organic layers were dried over sodium sulfate and filtered. The solvent was removed in vacuo to afford the crude desired product, which was purified by flash column chromatography (Merck silica gel 60, 40-63 μm, 20% ethyl acetate in hexanes) to afford the desired product, 4,4-difluoro-pyrrolidine-1,2-dicarboxylic acid 2-allyl ester 1-tert-butyl ester (5.85 g, 20.09 mmol, 74.5% yield) as a clear, slightly yellowish oil. 1H NMR (400 MHz, CDCl3) δ: 1.44 (9H, s), 2.43-2.54 (1H, m), 2.64-2.80 (1H, m), 3.78-3.94 (2H, m), 4.46-4.73 (3H, m), 5.24-5.37 (2H, m), 5.87-5.96 (1H, m).

Provenance & Evidence