Hexamethylphosphoramide → HCID 18610531, compound

Participants

Reaction Steps

270 mg of a 50% w/w suspension of sodium hydride in mineral oil were added to a solution containing 5 ml of hexamethylphosphoric triamide and 1.9 g of 5-oxo-3(R)-phenyl-6(R)-phthalimidoperhydro-1,4-thiazepine [prepared as described in step (e) above] dissolved in 20 ml of dimethylformamide, and the mixture was stirred for 5 minutes at room temperature, 1.8 g of t-butyl bromoacetate was then added to the mixture. The resulting mixture was stirred for 1 hour at room temperature, after which a further 0.2 g of a 55% w/w suspension of sodium hydride in oil and 1 g of t-butyl bromoacetate were added. The mixture was stirred for a further 1 hour at room temperature. Ethyl acetate was then added to the mixture, and the mixture was washed with an aqueous solution of sodium chloride and then dried over anhydrous magnesium sulfate, after which the solvent was distilled off. The residue was subjected to silica gel column chromatography, using a 1:40 by volume mixture of ethyl acetate and methylene chloride as eluent, to give 1.65 g of the title compound as an amorphous substance.

Provenance & Evidence