Epichlorohydrin → (1R)-2-Hydroxymethyl-1-(1-naphthyl)-cyclopropanecarbonitrile

Participants

Reaction Conditions

Reaction Steps

1-Naphthylacetonitrile (30 g, 180 mmole) was dissolved in dry tetrahydrofuran (THF, 300 mL) under nitrogen atmosphere, cooled to −15° C. and sodium-bis (trimethylsilylamide) in 1M tetrahydrofuran (180 mL) was added drop wise at −15° C. The resulting brown mixture was stirred for 45 min at −10° C. to 0° C. Then cooled the reaction mass to −15° C. A solution of S-(+) epichlorohydrin (16.6 g, 180 mmol) in tetrahydrofuran (20 mL) was added drop wise at −15° C. and stirred for 30 minutes. Sodiumbis (trimethylsilylamide) in 1M THF (180 mL) is added drop wise at −15° C. and the mixture was stirred for 45 min. The temperature of the reaction mass was then gradually raised to room temperature and maintained at room temperature for 30 minutes. The reaction is monitored by TLC (ethyl acetate/hexane (1:1)). The reaction was quenched with water (80mL). The aqueous layer was extracted with ethyl acetate (2×75 mL).The combined organic layer was washed with brine solution (200 mL), dried over anhydrous sodium sulphate, filtered and evaporated under reduced pressure to yield 55 g of crude oil, which was purified by column chromatography (silica gel, ethyl acetate/hexane (10:90) to yield 28 g (69%) of product. The 1H NMR shows mixture of diasteromers (2:1 cis/trans). 1H NMR δ((300 MHz,CDCl3, partial assignment): 1.57-1.62 (2H,m), 1.92-2.03 (1H,m), 3.10-3.25 (1H,br,s), 3.91-3.97 (1H,m) 4.22-4.27 (1H,m), 7.37-7.69 (4H,m), 7.82-7.92 (2H,m), 8.36-8.49 (1H,m).

Provenance & Evidence