Sulfuric Acid → HCID 131727390, compound

Participants

Reaction Steps

The acid of Example 19 (0.5 g) was dissolved in absolute ethanol (10 mL) and catalytic amount of conc. sulfuric acid was added. The reaction was stirred and heated to reflux overnight. Next day the reaction was concentrated and diluted with ethyl acetate and washed with 2.5N NaOH (2×20 mL), brine (20 mL) and dried over sodium sulfate. The crude mixture was purified by HPLC (eluted with CH3CN/H2O containing 0.1% TFA) to produce the desired product in 81% yield (0.43 g). MS(ES) m/e 536 [M+H]+. 1H-NMR (400 MHz, DMSO-d6) :8.35-8.48 (brs, 2H), 7.31-7.10 (m, 6H), 4.17-4.01 (m, 5H), 3.26-3.05 (m, 4H), 2.69-2.50 (m, 7H), 2.32 (t, 2H), 1.94 (d, 2H), 1.58-1.54 (t, 2H), 1.33 (s, 3H), 1.35 (s, 3H), 1.18 (t, 3H).

Provenance & Evidence