Ethyl Acetate → Benzyl [(3aS,4R,6S,6aR)-6-hydroxy-2,2-dimethyltetrahydro-2H,3aH-cyclopenta[d][1,3]dioxol-4-yl]carbamate

Participants

Reaction Steps

At about 0° C., benzyl carbonochloridate (18.4 g, 107.86 mmol, 1.05 equiv.) was added to the solution of (3aR,4S,6R,6aS)-6-amino-2,2-dimethyl-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-ol (17.0 g, 98.15 mmol, 1.00 equiv.) and sodium carbonate (20.8 g, 196.24 mmol, 2.00 equiv) in tetrahydrofuran:water (5:1) (600 mL). Standard extractive workup with ethyl acetate (3×200 mL) gave the title product as a white solid (20.5 g; yield=68%). 1H NMR (300 MHz, CDCl3) δ: 7.30-7.39 (m, 5H), 5.20 (s, 2H), 4.60 (d, J=5.4 Hz, 1H), 4.50 (d, J=5.4 Hz, 1H), 4.27 (s, 1H), 4.19 (d, J=5.7 Hz 1H), 2.26 (m, 1H), 1.71 (d, J=14.4 Hz, 1H), 1.47 (s, 3H), 1.28 (s, 3H).

Provenance & Evidence