Benzyl Bromide → Benzyl (2S)-3-cyclobutyl-2-hydroxypropanoate

A mixture of 1.05 g (7.3 mmol) of 2-(S)-hydroxy-3-(cyclobutyl)propanoic acid (from Step D), 40 mL (10.0 mmol) of TEA and 1.20 mL (10.0 mmol) of benzyl bromide in 8 mL of DMF was stirred at rt for 2 h. The mixture was partitioned between 200 mL of ether and 100 mL of H2O and the layers were separated. The organic layer was washed with 100 mL of 2.0 N HCl, 100 mL of sat'd NaHCO3, 2×100 mL of H2O, 100 mL of sat'd NaCl, dried over MgSO4 and concentrated. Flash chromatography on 60 g of silica gel using 4:1 v/v hexanes/ether as the eluant afforded 1.20 g (70%) of the title compound: 1H NMR (500 MHz) δ 1.58-1.70 (m, 2H), 1.72-1.82 (m, 2H), 1.84-1.92 (m, 2H), 1.98-2.10 (m, 2H), 2.46-2.58 (m, 1H), 2.63 (br s, 1H), 4.15 (dd, J=7.5, 3.0), 7.33-7.40 (m, 5H).

1. customThe mixture was partitioned between 200 mL of ether and 100 mL of H2O
2. customthe layers were separated
3. washThe organic layer was washed with 100 mL of 2.0 N HCl, 100 mL of sat'd NaHCO3, 2×100 mL of H2O, 100 mL of sat'd NaCl
4. dry with materialdried over MgSO4
5. concentrationconcentrated

ORD record

ord-65d2a03dc42448b8a85edc652a3a3761

Source dataset

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06248755B1