Ethyl Acetate → HCID 15307270, compound

Participants

Reaction Steps

A solution of 3 g of difluoromethyldiphenylphosphine oxide in 80 ml of tetrahydrofuran is slowly mixed with 5.85 ml of 2 M lithium diisopropylamide solution at a bath temperature of -50° C., and it is stirred for 1 hour. Then, a solution of 1.8 g of 11β-methoxy-3-tetrahydropyranyloxy-estra-1,3,5(10)-trien-17-one in 40 ml of tetrahydrofuran is slowly added, stirred for 15 minutes, slowly heated at a bath temperature of from -50° C. to 100° C. and refluxed for 2.5 hours. For working-up, it is diluted with ethyl acetate and water, suctioned off on Celite, rewashed with ethyl acetate, washed with water as well as with saturated sodium chloride solution, dried on sodium sulfate, concentrated by evaporation in a vacuum and chromatographed on silica gel with hexane/ethyl acetate/triethylamine. 1.3 g of 17-difluoromethylene-11β-methoxy-3-tetrahydropyranyloxy-estra-1,3,5(10)-triene is obtained with a melting point of 124-125° C., [α]D22 =+60.0° (c=0.505% in pyridine).

Provenance & Evidence