Phenyl isocyanate → HCID 11603316, compound

Participants

Reaction Steps

To a solution of 1.3 g (5 mmol) 3,4-dihydro-2-methyl-3-oxo-2H-naphtho[2,3-e]-1,2-thiazine 1,1-dioxide and 0.7 ml (5 mmol) triethylamine dissolved in 10 ml DMSO at room temperature was added 0.6 g (5 mmol) phenylisocyanate. After stirring for 20 hr the resulting mixture was quenched with dilute HCl in an ice bath and then extracted with ether (2 times). The combined ether extracts were washed, dried and concentrated to give 1.9 g crude product. This material was recrystallized from ethanol followed by recrystallization from ethylacetate to give 0.7 g 3,4-dihydro-2-methyl-3-oxo-2H-naphtho[2,3-e]-1,2-thiazine-4-carboxanilide 1,1-dioxide.

Provenance & Evidence