Sodium hydride → HCID 86638599, compound

Participants

Reaction Steps

To a suspension of sodium hydride, 80% oil dispersion (222 mg, 7.25 mmol) in ethyleneglycol dimethyl ether (20 mL) was added a solution of (1R,2R)/(1S,2S)-2-(1,4-dioxa-7-azaspiro[4.4]non-7-yl)cyclohexanol (1.5 g, 6.60 mmol, step (v) of Example 15) in ethylene glycol dimethyl ether (10 mL). The resulting mixture was stirred at room temperature for 2 hours and then a solution of 2,6-dichlorobenzyl bromide (1.9 g, 7.9 mmol) in ethylene glycol dimethyl ether (10 mL) was added. The reaction mixture was refluxed for 16 hours under argon atmosphere, the solvent was evaporated in vacuo and the residue was taken up with water (70 mL). The aqueous solution was acidified to pH 0.5 with 6M HCl aqueous solution and then extracted with diethyl ether (2×40 mL). Basification of the aqueous solution to pH 4.5-5.5, followed by extraction with diethyl ether (4×40 mL), drying of the combined organic extracts over sodium sulfate and evaporation of the solvent in vacuo provided the intermediate title compound.

Provenance & Evidence