Sodium hydride → Tert-butyl 4-(4-fluorophenyl)-2-((5-methylisoxazol-3-yl)methyl)-1-oxo-2,7-diazaspiro[4.5]decane-7-carboxylate

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Reaction Conditions

Reaction Steps

Tert-butyl 4-(4-fluorophenyl)-1-oxo-2,7-diazaspiro[4.5]decane-7-carboxylate (200 mg; 0.574 mmol) was solubilised in DMF (5 ml) and cooled to 0° C. 60% Sodium hydride dispersion in mineral oil (46 mg, 1.148 mmol) was added and the mixture stirred at 0° C. for 45 minutes. 3-(Bromomethyl)-5-methylisoxazole (101 mg; 0.574 mmol) was solubilised in DMF (0.7 ml) and added. The reaction was stirred at 0° C. for 30 minutes then warmed to RT for 3 hr. The mixture was quenched with water and extracted with EtOAc. The organics were combined and washed with brine and dried over magnesium sulphate, filtered and concentrated in vacuo. The resultant oil was purified by chromatography on silica eluting with 50-100% TBME in iso-hexane to yield tert-butyl 4-(4-fluorophenyl)-2-((5-methylisoxazol-3-yl)methyl)-1-oxo-2,7-diazaspiro[4.5]decane-7-carboxylate.

Provenance & Evidence