Methanesulfonyl chloride → HCID 10861453, compound

Participants

Reaction Steps

To a solution of (4R)-1-(tert-butyloxycarbonyl)-4-hydroxy-L-proline tert-butyl ester (573 mg, 1.99 mmol) in pyridine (3.5 mL) cooled to 0° C. was added methanesulfonyl chloride (0.31 mL, 3.99 mmol). The reaction mixture was stirred for 2 hours at ice temperature, diluted with ethyl acetate (30 mL), washed with 1M sodium hydrogencarbonate solution, 1M citric acid, water, dried (Na2SO4), and evaporated. The crude product was purified by flash silica gel chromatography eluting with 1% methanol/dichloromethane; yield 686 mg (94%). 400 MHz 1H NMR (CDCl3): δ1.42-1.44 (2s, 18H); 2.20 (m, 1H); 2.60 (m, 1H); 3.02 (s, 3H); 3.68-3.86 (m, 2H); 4.29 (m, 1H); 5.22 (m, 1H).

Provenance & Evidence