Water → HCID 12056718, compound

Participants

Reaction Conditions

Reaction Steps

The title compound of Step A (9.0 g, 38 mmol) was dissolved in 50 mL of tetrahydrofuran and treated with methyl lithium (1.4 M in ether, 34 mL, 47 mmol) at a temperature of −70° C. The reaction mixture exothermed to −35° C. The mixture was stirred at −30° C. for 1.5 h and then treated with 1 mL of water and dichlorodicyanoquinone (9.44 g, 42 mmol). The mixture was stirred at 25° C. for 30 minutes and then partitioned twice between 100 mL of water and 100 mL of dichloromethane. The combined organics were washed with brine and dried over magnesium sulfate. The residue after evaporation was subjected to silica gel chromatography using hexanes/ethyl acetate (95:5) as eluent to give 9.02 g of the title compound of Step B as a white solid melting at 128-131° C. 1H NMR (CDCl3): δ2.31 (s, 3H), 2.56 (s, 3H), 7.71 (d, 2H), 8.49 (d, 2H), 8.53 (s, 1H).

Provenance & Evidence