m-Chloroperbenzoic acid → HCID 11429988, compound

Participants

Reaction Steps

To a solution of 1.73 g (4.30 mmol) of 13 in 15 mL of dichloromethane under argon was added 2.03 g (6.50 mmol) of 55% m-chloroperbenzoic acid (MCPBA). After refluxing for 10 h, the solution was diluted with 30 mL of water and extracted three times with diethyl ether (50 mL each). The combined extracts were washed twice with saturated aqueous NaHCO3 (30 mL each), 30 mL of water, and 30 mL of brine, dried (MgSO4), concentrated, and column chromatographed on silica gel using hexane as eluent to give 1.24 g (70% yield) of 3,4-bis-(t-butyldimethylsilyloxy)-5-chlorophenyl formate. 1H NMR (CDCl3) δ 8.22 (s, 1H, CHO), 6.79 (d,J=3.2 Hz, 1H), 6.58 (d,J=3.2 Hz, 1H), 1.03 (s, 9H, t-Bu), 0.96 (s, 9H, t-Bu), 0.22 (s, 6H, Me), 0.19 (s, 6H, Me); 13C NMR (CDCl3) δ 159.0 (s, C═O), 148.8 (s), 143.0 (s), 142.4 (s), 127.1 (s), 115.5 (d), 113.1 (d), 26.2 (q, 6C, t-Bu), 18.8 (s, 2C, t-Bu), −3.3 (q, 2C, Me), −3.6 (q, 2C, Me).

Provenance & Evidence