Triethylamine → HCID 14673937, compound

Participants

Reaction Steps

1.29 g (5.48 mmol) of (+)-7,8-dihydro-6,6-dimethyl-7-hydroxy- 8-amino-6H-pyrano[2,3-f]benz-2,1,3-oxadiazole [compound (+)I], 690 mg (6.8 mmol) of triethylamine and 40 ml of methylene chloride were stirred at room temperature while 610 mg (6.6 mmol) of propionyl chloride was added thereto. The mixture was stirred at room temperature for four hours. The reaction mixture was extracted with 600 ml of ethyl acetate and 300 ml of water. The organic phase was collected and dried over anhydrous sodium sulfate. The filtrate and the residue obtained after distilling off the solvent were crystallized from a solvent mixture comprising 10 g of ethyl acetate and 5 g of hexane, allowed to stand in a refrigerator overnight and then filtered by means of suction. The obtained crystals were washed with 3-ml portions of ethyl acetate/hexane (2 1) twice and dried under reduced pressure to thereby give the titled compound in the form of a colorless product.

Provenance & Evidence