Methyl iodide → Methyl (R)-3-((tert-butoxycarbonyl)(methyl)amino)-2,3-dihydro-1H-indene-5-carboxylate

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Reaction Steps

A solution of (R)-methyl 3-(tert-butoxycarbonylamino)-2,3-dihydro-1H-indene-5-carboxylate (stage (ii) A-07) (60 g, 20.62 mmol, 1.0 eq.) in DMF (20 ml) was added dropwise at 0° C. to a suspension of NaH (1.24 g, 30.93 mmol, 1.5 eq., 60% in mineral oil) in DCM (20 ml) and stirring was carried out for 30 minutes. Methyl iodide (2.6 ml, 41.24 mmol, 2.0 eq.) was then added at 0° C. and stirring was carried out for 3 hours at RT. After monitoring by TLC, sat. ammonium chloride solution (200 ml) was added and extraction with ethyl acetate (3×250 ml) was carried out. The combined org. phases were washed with water and sat. NaCl solution (in each case 400 ml), dried over sodium sulfate, concentrated under reduced pressure. The crude product was purified by column chromatography (silica gel, 10% ethyl acetate in hexane). Yield: 95% (6.0 g, 19.67 mmol).

Provenance & Evidence