Water → HCID 69338646, compound

Participants

Reaction Conditions

Reaction Steps

(2R)-Acetylamino-2-methyl-4-(5-bromothiophen-2-yl)butyl acetate (1.38 g, 3.95 mmol) obtained in Example 47 (c) was dissolved in dimethylformamide (20 ml), and then propargylalcohol (0.69 ml, 11.9 mmol), triethylamine (5.60 ml, 40.1 mmol), copper(I) iodide (76 mg, 0.40 mmol), and dichlorobis(triphenylphosphine)palladium (276 mg, 0.39 mmol) were added thereto followed by stirring for 1 hour at 80° C. under a nitrogen atmosphere. The reaction solution was poured into water, extracted with ethyl acetate, and after the ethyl acetate layer was dried over anhydrous sodium sulfate, the solvent was evaporated in vacuo. The residue was purified by chromatography on a silica gel column (elution solvent; hexane:ethyl acetate=3:1-1:3) to afford the title compound (685 mg, 54% yield) as a white crystalline solid.

Provenance & Evidence