Triethylamine → HCID 58428065, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-(2,5-dimethyl-phenyl)-4-hydroxy-8-methoxy-1-methoxymethoxy-1,8-diaza-spiro[4.5]dec-3-en-2-one (compound P2ii.2) (200 mg, 0.55 mmol), triethylamine (0.153 ml, 111 mg, 1.10 mmol) and a catalytic amount of 4-dimethylaminopyridine in tetrahydrofuran (6 ml) at 0° C. was added cyclopropanecarboxylic acid chloride (0.066 ml, 75 mg, 0.72 mmol) dropwise. The suspension was stirred at 0° C. for 10 minutes, and at room temperature for one hour. The reaction mixture was evaporated, diluted with ethyl acetate and filtered to remove salts. The filtrate was washed with a saturated aqueous sodium hydrogen carbonate solution and brine, dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel (ethyl acetate/hexane 1:2) to afford 200 mg of an oily product. This material was triturated with diethyl ether, filtered and dried. Yield: 190 mg of cyclopropanecarboxylic acid 3-(2,5-dimethyl-phenyl)-8-methoxy-1-methoxymethoxy-2-oxo-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester (title compound P1ii.4) as a white solid, mp 114-116° C.

Provenance & Evidence