Nitrogen → 4-Hydroxy-3-phenoxy-6-phenyl-2H-pyran-2-one

Participants

Reaction Conditions

Reaction Steps

To a pressure reactor was added 2-phenoxypropanedioicacid diethylester 8.11 g (0.032 moles) and 1-phenyl-1-(trimethylsilyloxy)ethylene 12.35 g (0.064 moles). The vessel was pressurized to 600 psi with N2. The mixture was heated at 100° C. for 8 hours then an additional 63.5 hours at 147°-154° C. The vessel was cooled to room temperature and rinsed with ethyl acetate. Crude flash chromatography (hexane/ethyl acetate 1/1) afforded partially purified material which was then flashed on silica gel using hexane/ethyl acetate 95/5-40/60 as eluents. The resulting solid was recrystallized from diethyl ether and ethyl acetate to afford 1.64 g (18%) of the title compound (mp=215°-219° C.). 1H NMR (400 MHz, DMSO-d6) δ 6.90 (s, 1 H), 6.95 (dd, 2 H), 7.02 (t, 1 H), 7.28-7.33 (m, 2 H), 7.52-7.56 (m, 3 H), 7.80-7.856 (m, 2 H), 12.0 (bs, 1 H).

Provenance & Evidence