Methanesulfonyl chloride → Methyl 5-(chloromethyl)-2-methoxybenzoate

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Reaction Steps

Combine methyl 2-methoxy-5-hydroxymethylbenzoate (1.34 g, 6.8 mmol) and N,N-diisopropylethylamine (1.4 mL) in dichloromethane (25 mL). Cool in a ice-bath. Add dropwise, methanesulfonyl chloride (0.56 mL). After 30 minutes, warm to ambient temperature. After 2 hours, dilute with dichloromethane and extract with 1 M hydrochloric acid solution and 5% sodium bicarbonate solution. Dry the organic layer over Na2SO4, filter, and concentrate in vacuo to give methyl 2-methoxy-5-chloromethylbenzoate: Rf=0.64 (silica gel, 1/1 ethyl acetate/hexane).

Provenance & Evidence