2,3-Dihydrofuran → HCID 58427984, compound

Participants

Reaction Steps

To a solution of carbonic acid ethyl ester 1-hydroxy-8-methoxy-2-oxo-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester (150 mg, 0.37 mmol) in dichloromethane (3 ml) under argon atmosphere was added 2,3-dihydro-furan (56 μl, 52 mg, 0.74 mmol) and a catalytic amount of p-toluenesulfonic acid monohydrate (2 mg). The reaction mixture was stirred at room temperature for 4 hours, diluted with dichloromethane, washed twice with brine, dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel (ethyl acetate/hexane 2:1). Yield: 114 mg of carbonic acid ethyl ester 8-methoxy-2-oxo-1-(tetrahydro-furan-2-yloxy)-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester (title compound P1ii.9) as a colorless gum.

Provenance & Evidence