Dichloromethane → HCID 54341699, compound

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Reaction Steps

N-isobutoxycarbonyl-2-(4-formylphenyl)-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (500 mg) was added to carboxymethyl triphenylphosphonium bromide (429 mg) in a mixture of saturated aqueous sodium hydroxide (1.25 ml) and methylene chloride (4 ml) and stirred vigorously at ambient temperature for 1.5 hours. Water (20 ml) was added and the mixture extracted with dichloromethane (2×20 ml). The combined organic extracts were, washed with water (5 ml), dried (MgSO4) and evaporated. The residue was purified by chromatography on a Mega Bond Elut column, eluting with a gradient of 0-30% ethyl acetate in hexane. Fractions containing the product were combined, evaporated and the residue was triturated with diethyl ether/isohexane (1:1 v/v) and filtered to give N-isobutoxycarbonyl-2-[4-(2-[methoxycarbonyl]vinyl)phenyl]-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (366 mg), m.p 155°-156° C.; 1H NMR (CDCl3): 0.65 (d, 6 H), 1.7 (septet, 1 H), 2.5 (s, 3 H), 3.82 (s, 3 H), 3.85 (d, 2 H), 3.98 (s, 3 H), 6.48 (d, 1 H), 7.4-7.8 (m , 7 H), 7.9 (s, 1 H), 8.86 (dd, 1 H), 8.98 (dd, 1 H).

Provenance & Evidence