Sodium hydride → HCID 23047247, compound

Participants

Reaction Conditions

Reaction Steps

1.45 g (5 mmol) 5-(3,6-dihydro-6-methyl-2-oxo-2H-1,3,4-thiadiazin-5-yl)-1,3-dihydro-3,3-dimethyl-2H-indol-2-one (Example 3) in 30 ml DMF were cooled to 0° C. 0.12 g (5 mmol) sodium hydride from a 55% dispension in mineral oil was added and the mixture was stirred for 0.5 hr at 0° C. then 0.5 hr at 20° C. After cooling to 0° C. a solution of 1 g trichloroacetyl isocyanate in 5 ml dry methylene chloride was added dropwise. The reactional mixture was stirred at room temperature overnight. The solvent was evaporated under vacuum, the residue taken up in 50 ml ethyl acetate and 40 g neutral aluminum oxide was added. The compound was then extracted from the aluminum oxide on a column with ethyl acetate. The solvent was evaporated and the residue was purified by chromatography on silica (eluent:methylene chloride/ethyl acetate: 2/1) to yield 0.37 g (22%) of the desired compound.

Provenance & Evidence