Dimethyl Sulfoxide → HCID 59201564, compound

Participants

Reaction Conditions

Reaction Steps

A solution of DMSO (0.82 g, 10.47 mmol) in 10 mL of dry CH2Cl2, under protection of N2, was cooled to −78° C., followed by the slow, dropwise addition of oxalyl chloride (0.664 g, 5.23 mmol). After addition the mixture was stirred 2 hr at −65° C., then the solution of (S)-tert-butyl 1-(4-hydroxycyclohexyl)-3-(N-methyl-N-(benzyloxycarbonyl)amino)propan-2-ylcarbamate (1.1 g, 2.62 mmol) was added dropwise. After addition, the mixture was stirred 3 hr at −30° C. The reaction was quenched with Et3N (4 mL) and stirred 10 min, then saturated NaHCO3 (10 mL) was added. The aqueous layer was extracted 3 times with CH2Cl2 (3×20 mL). The CH2Cl2 layer was washed with 10% citric acid solution (20 mL), followed by saturated NaHCO3, brine, then dried over Na2SO4. After filtration, solvent removal gave crude product (1 g), which was purified by preparative TLC to give (S)-tert-butyl 1-(N-methyl-N-(benzyloxycarbonyl)amino)-3-(4-oxocyclohexyl)propan-2-ylcarbamate (500 mg, 1.2 mmol).

Provenance & Evidence