6-Methoxy-m-toluenesulfonyl chloride → 1-(2-Methoxy-5-methyl-benzenesulfonyl)-1,2,3,4-tetrahydro-quinoline-7-carboxylic acid methyl ester

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Reaction Steps

A solution of 1,2,3,4-tetrahydro-quinoline-7-carboxylic acid methyl ester (23.00 g, 0.12 mol) in dichloromethane (0.70 L) and pyridine (0.10 L) was treated with 2-methoxy-5-methyl-benzenesulfonyl chloride (31.78 g, 0.14 mol) and the mixture stirred at room temperature for 18 hours. The reaction mixture was then washed with 0.5 N HCl (0.40 L), water (2 times 0.40 L) and brine (0.25 L) and the organic phase dried over sodium sulphate and evaporated. The residue was sonicated in ether/dichloromethane 95:5 and the precipitate filtered and dried under vacuum. 1-(2-Methoxy-5-methyl-benzenesulfonyl)-1,2,3,4-tetrahydro-quinoline-7-carboxylic acid methyl ester was obtained as an off-white solid, 42.05 g (93%), MS (ISP): m/e=376.4 (M+H).

Provenance & Evidence