Dimethylformamide → 2-[4-Methylsulfanyl-3-(2-m-tolyl-ethoxy)-benzoylamino]-indane-2-carboxylic acid methyl ester

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Reaction Steps

The compound of step 3 (395 mg, 1.31 mmol) was dissolved in DCM (5 ml). DMF (29 mg, 0.39 mmol) and oxalyl chloride (3.9 ml of a 2 M solution in DCM) were added at room temperature. The mixture was stirred for 60 min, evaporated to dryness in vacuo, dissolved in dioxane and evaporated again. The residue was dissolved in DCM (2 ml) and the solution was slowly added with stirring to an ice-cooled mixture of 2-amino-indane-2-carboxylic acid methyl ester hydrochloride (5.42 g, 23.8 mmol), EA and an excess of saturated aqueous sodium hydrogencarbonate solution. After 2 h, the organic layer was separated, washed with a saturated sodium chloride solution, dried over sodium sulfate, filtered and evaporated to dryness. 582 mg of the title compound were obtained.

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