3-Boc-2,2-dimethyloxazolidine-4-carboxaldehyde, (S)-(-)- → 117487-58-8

Participants

Reaction Conditions

Reaction Steps

To a −78° C. solution of (S)-Garner aldehyde (3, 7.0 g, 30.5 mmol) in dry THF (50 mL) under N2 was slowly added vinylmagnesium bromide (92 mL, 92 mmol, a 1 M solution in THF) via cannula. After the cloudy yellow solution was stirred for 2 h at −78° C., it was warmed to 0° C., and the reaction was quenched with saturated aqueous NH4Cl solution (60 mL). The product was extracted with Et2O (2×60 mL). The combined organic layers were washed with brine (60 mL), dried (Na2SO4), and concentrated. The mixture of erythro and threo diastereomers was separated by column chromatography by gravity (hexane/EtOAc 5:1) to afford 4 (4.8 g, 62%) and its C3-epimer 4a (0.8 g, 10.2%). Compound 4: [α]25D −37.7° (c 1.8, CHCl3); Rf 0.26 (EtOAc/hexane 1:3); 1H NMR (CDCl3) δ 1.48 (s, 3H), 1.50 (s, 9H), 1.58 (s, 3H), 3.91 (m, 2H), 3.98 (m, 1H), 4.25 (m, 1H), 4.39 (m, 1H), 5.24 (m, 1H), 5.38 (m, 1H), 5.85 (m, 1H); 13C NMR (CDCl3) δ 24.2, 26.3, 28.3, 61.8, 64.4, 73.3, 81.4, 94.4, 116.1, 117.8, 137.6, 155.0; ESI-HRMS [M+Na]+ C13H23NO4Na calcd for m/z 280.1525, found 280.1519.

Provenance & Evidence