Benzyl Bromide → HCID 18005882, compound

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Reaction Steps

A solution of ethyl 6-chloro-7-hydroxychroman-2-carboxylate (3.0 g, 11.7 mmol) in THF is treated with NaH (3.0 equiv, 35 mmol) at 0° C., stirred for 20 minutes, treated with benzylbromide (3.0 g, 17.5 mmol), stirred for 16 hr, concentrated and diluted with water and EtOAc. The aqueous phase is separated, acidified to pH 1-2 with 2N HCl and extracted with EtOAc. The extracts are combined, dried over MgSO4 and concentrated in vacuo. The resultant residue is dissolved in methanol, treated with a catalytic amount of p-toluenesulfonic acid, heated at reflux temperature for 18 hr, cooled and concentrated in vacuo. This resultant residue is triturated under EtOAc/hexanes and filtered. The filtercake is further purified by short-column chromatography (silica gel, 5:1 hexane:EtOAc as eluent) to afford the title product as a light yellow solid, 2.7 g (6.9% yield), identified by NMR and mass spectral analyses.

Provenance & Evidence