1,3-Dibromo-5,5-dimethylhydantoin → HCID 59232168, compound

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Reaction Steps

A suspension of Example 100 in THF (5 mL) was cooled to −78° C. and treated with diisopropylethyl amine (0.424 mL, 2.57 mmol) followed by trimethylsilyltriflate (0.421 mL, 2.177 mmol). The reaction was allowed to warm to rt over 30 min, then cooled again to −78° C. and treated with 1,3-dibromo-5,5-dimethylhydantoin (62 mg, 0.218 mmol). The reaction was allowed to stir for 1 h at −78 C, then warmed to rt and quenched with methanol (200 uL) and diluted with ethyl acetate and 1N sodium sulfite solution. The organic layer was separated, washed with 1 N bisulfate buffer (pH 2), dried with sodium sulfate and passed thru a silica plug. Evaporation of the solvent gave a yellow solid which was triturated with Et2O:hexanes (1:1) to provide the title compound as a yellow solid (154 mg, 70% Yield). 1H-NMR (DMSO-d6) δ 9.18 (s, 1H), 8.45 to 8.48 (m, 1H), 8.02 (s, 1H), 7.43 (d, J=8.4 Hz, 2H), 7.27 (d, J=8.4 Hz, 2H), 7.27 (s, 1H), 7.20 to 7.37 (m, 4H), 4.77 (s, 2H). MS [M+H]+=551.2; LCMS RT=3.63.

Provenance & Evidence