Acetic Anhydride → HCID 86691820, compound

Participants

Reaction Steps

To a solution of 12 g (10 mmol) of Cyclosporin A (MW: 1202.61) in 40 ml of acetic anhydride (MW: 102.09, d 1.082), 40 ml of pyridine (MW: 79.01, d 0.978) and 0.4 g of 4-N,N-dimethylaminopyridine (MW: 122.17) was added. This solution was stirred for overnight at room temperature, and then the mixture was diluted with 600 ml of ethyl acetate. The mixture was washed with brine, saturated ammonium chloride water solution and with 15% of sodium bicarbonate. The organic phase was dried with sodium sulphate. filtered and evaporated under the reduced pressure. The toluene was added to the mixture until all of pyridine was evaporated to yield the pale yellow solid residue, which was purified by flash chromatography on a silica gel column (100-200 mesh) with eluent of ethyl acetate in haxene (1/3) to give the 11.8 g (9.48 mmol, 95%) of Cyclosporin A-acetate (MW: 1244.65).

Provenance & Evidence