Methyl iodide → HCID 14698663, compound

Participants

Reaction Conditions

Reaction Steps

Distilled diisopropylamine (1.98 g, 19.6 mmol) was added to dry tetrahydrofuran (10 ml) under anhydrous conditions. To the stirred solution at 0° C. was added 1.55M n-butyllithium (12.6 ml, 19.6 mmol) in hexane dropwise. After 15 minutes a solution of the compound (1a) (2.2 g, 7.8 mmole) in tetrahydrofuran (10 ml) was added dropwise at 0° C. The reaction mixture was stirred for 1 hour at ambient temperature 30 minutes at 50° C. and then cooled to 0° C. Methyl iodide (2.78 g, 19.6 mmol) was added dropwise, and the reaction mixture stirred at ambient temperature for about 16 hours. The reaction was quenched with saturated ammonium chloride (20 ml) and acidified with 3N hydrochloric acid. The reaction mixture was extracted with diethyl ether (3×100 ml), the extracts combined, washed with saturated aqueous sodium chloride, dried over magnesium sulfate and concentrated in vacuo to give a tan solid. This compound was chromatographed on a 5×15 cm column of silica gel eluted with 5 percent isopropanol/hexane to yield the desired product as a solid, m.p. 78-80° C.

Provenance & Evidence