Sodium hydride → HCID 131735326, compound

Participants

Reaction Steps

A solution of tert-butyl ((6R,7R)-7-(5-bromo-2-fluoropyridin-3-yl)-6-(2-hydroxyethyl)-7-methyl-5,5-dioxido-5-thia-8-azaspiro[3.5]non-8-en-9-yl)carbamate (1.04 g, 1.998 mmol) in THF/DMF (20/2 mL) was brought to 0° C. followed by the addition of sodium hydride, 60% dispersion in mineral oil (0.200 g, 5.00 mmol) in one portion. After one min stirring at 0° C. the ice bath was removed. The reaction became yellow. More sodium hydride, 60% dispersion in mineral oil (0.200 g, 5.00 mmol) was added at rt and stirred for 20 min more. The reaction went to completion (3:1 mixture of epimers). The mixture was brought to 0° C. and carefully quenched with saturated NH4Cl and water was added. The reaction mixture was extracted with EtOAc and the combined organics were dried over Na2SO4, filtered, concentrated and chromatographed on silica gel using 0-30% EtOAc/hexanes to afford each isomer as a white solid tert-butyl ((4a′S,11b′R)-10′-bromo-11b′-methyl-4′,4′-dioxido-4a′,5′,6′,11b′-tetrahydrospiro[cyclobutane-1,3′-pyrido[3′,2′:6,7]oxepino[4,5-b][1,4]thiazin]-2′-yl)carbamate (0.46 g, 0.919 mmol, 46.0% yield). LC/MS (ESI+) m/z=521.8 (M+H).

Provenance & Evidence