Triethylamine → HCID 58537933, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-hydroxy-8-methoxy-1-methyl-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-2-one (compound P2.2) (350 mg, 1.06 mmol) and triethylamine (0.221 ml, 160.7 mg, 1.59 mmol) in tetrahydrofuran (10 ml) at 0° C. was added pivaloyl chloride (0.143 ml, 140.1 mg, 1.16 mmol) dropwise. The suspension was stirred at 0° C. for two hours. The reaction mixture was diluted with ethyl acetate and water, the layers separated, the aqueous phase extracted with ethyl acetate, the combined organic phases washed with brine, dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel (ethyl acetate). Yield: 344 mg of 2,2-dimethyl-propionic acid 8-methoxy-1-methyl-2-oxo-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester (compound P1.31) as a colorless gum.

Provenance & Evidence