Dimethyl Sulfate → HCID 86589033, compound

Participants

Reaction Steps

The product of Step 1 (721 mg) is dissolved in ethyl acetate (25 mL). DBU (242 mg) is added, followed by dimethyl sulfate (201 mg) and the reaction is stirred at room temperature for 2 hours, then diluted with 0.2 M HCl. The organic phase is washed with water and brine, then dried over magnesium sulfate and evaporated. Purification by flash chromatography on silica gel eluting with hexanes-ethyl acetate (2:1) affords 5-acetoxyfuran-2-carboxylic acid (6S,9S,10S,11S,13S,16R,17R)-9,11-epoxy-6-fluoro-17-methoxycarbonyl-10,13,16-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl ester. Selected NMR signals (CDCl3) δ 0.96 (3H, d), 0.98 (3H, s), 1.40 (3H, s), 2.18 (3H, s), 2.76 (3H, s).

Provenance & Evidence