4-Fluorobenzenesulfonyl chloride → (R)-Methyl 3-(4-fluorophenylsulfonamido)-2,3-dihydro-1H-indene-5-carboxylate

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Reaction Steps

DIPEA (447 μl, 2.634 mmol, 3 eq) was added at 0° C. to a solution of (3R)-3-amino-2,3-dihydro-1H-indene-5-carboxylic acid methyl ester hydrochloride (A-01) (0.878 mmol, 1 eq) in dichloromethane (10 ml). A solution of 4-fluorobenzene-1-sulfonyl chloride (170 mg, 0.878 mmol, 1 eq) dissolved in dichloromethane (6 ml) was added dropwise and the mixture was stirred for 16 h at RT. After monitoring by thin-layer chromatography. the reaction solution was concentrated under reduced pressure and the residue was taken up in ethyl acetate, washed with 10% ammonium chloride solution, sodium hydrogen carbonate solution and sat. NaCl solution (in each case 1x), dried over sodium sulfate and concentrated. The crude product was purified by column chromatography (silica gel, ethyl acetate:cyclohexane 1:5). Yield: 88%

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