Dimethyl Sulfoxide → tert-butyl N-[(2S)-4-methyl-1-oxopentan-2-yl]carbamate

Participants

Reaction Conditions

Reaction Steps

A solution of sulfur trioxide pyridine complex (7.8 g, 49.1 mmol, 3.0 equiv) in a 1:1 mixture of DMSO and CH2Cl2 (100 mL) was added to a solution of BOC-L-Leucinol (3.56 g, 16.4 mmol. 1 equiv) and Et3N (8 mL) in a 1:1 mixture of DMSO and CH2Cl2 (100 mL) at 0° C. The reaction mixture was stirred at 23° C. for 30 min, then poured into ice water (300 mL), and extracted with Et2O (2×200 mL). The combined organic layers were washed with 0.5M HCl (150 mL), half saturated NaHCO3 (150 mL) and H2O (2×150 mL), then dried over Na2SO4, and concentrated to afford crude BOC-L-Leucinal as pale yellow oil (3.48 g, 99%). This material was used without further purification. 1H NMR (CDCl3) δ 0.92-0.94 (m, 6H), 1.44 (s, 9H), 1.59-1.64 (m, 1H), 1.67-1.85 (m, 2H), (4.21 (m, 1H), 5.12 (s, br, 1H), 9.57 (s, 1H).

Provenance & Evidence