Ammonium Chloride → HCID 66643933, compound

Participants

Reaction Steps

A dichloromethane solution of 5-(2-hydroxyethyl)-7-methoxy-2-benzofuran-1(3H)-one was placed cooled to 0° C., and slowly treated with methanesulfonyl chloride (0.11 mL, 1.4 mmol) and TEA (0.2 mL, 1.44 mmol). The resulting mixture was then stirred for 20 min. TLC (hexanes/EtOAc=1/1) indicated completion of the reaction. The mixture was poured into saturated ammonium chloride and extracted with dichloromethane. The combined organics were washed with 1 N HCl, saturated sodium bicarbonate solution, and brine, then dried (Na2SO4) and concentrated in vacuo. To the residue (LC/MS: [(M+1)]+=287; tR=0.81 min) (0.16 g, 0.56 mmol) was added DBU (0.19 mL, 1.26 mmol) and dichloromethane (2 mL) and stirred for 2 h. TLC monitoring showed conversion to the olefin. The reaction mixture was diluted with water and extracted with dichloromethane. The combined organics were washed with 1N HCl, saturated sodium bicarbonate solution, and brine, then dried (Na2SO4) and concentrated to dryness. The resulting oil was used in the next step without further purification.

Provenance & Evidence