Diisopropylethylamine → (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl N-(2-{[(tert-butoxy)carbonyl]amino}-2-methylcyclopentyl)carbamate

Participants

Reaction Steps

To a solution of tert-butyl N-(2-amino-1-methylcyclopentyl)carbamate (Intermediate 24; 5.49 ml, 26.1 mmol) in DCM (87 ml) at 0° C. was added DIPEA (4.56 ml, 26.1 mmol) followed by (1R,2S,5R)-5-methyl-2-(propan-2-yl)cyclohexyl chloroformate (CAS number 14602-86-9; 17.15 g, 78 mmol) drop wise. The reaction mixture was allowed to warm to room temperature and stirred overnight. The reaction was diluted with DCM (150 ml) and a saturated solution of sodium bicarbonate solution (200 ml). The aqueous layer was re-extracted with DCM (100 ml) and the combined organics were washed further with a saturated solution of sodium bicarbonate (100 ml), dried over magnesium sulfate and concentrated in vacuo. The residue was purified by column chromatography (silica, 0-50% ethyl acetate/petrol) to afford the title compound.

Provenance & Evidence