Triphenylphosphine → 3-Methyl-5-[3-[4-(5-methyl-1,2,4-oxadiazol-3-yl)-2,6-dimethylphenoxy]propyl]-1,2,4-thiadiazole

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Reaction Conditions

Reaction Steps

A mixture of 5-(3-hydroxypropyl)-3-methyl-1,2,4-thiadiazole (66 mg, 0.42 mmol), 4-(5-methyl-1,2,4-oxadiazol-3-yl)-2,6-dimethylphenol (94 mg, 0.46 mmol), and DEAD (80 mg, 0.46 mmol) was dissolved in 5 mL of THF. To the above solution was added triphenylphosphine (120 mg, 0.46 mmol) at 0° C. and the mixture was allowed to warm to 20° C. overnight. The solvent was removed in vacuo, an aqueous sodium bicarbonate solution was added, and the mixture was extracted with methylene chloride (3×). The organic layer was dried over sodium sulfate and concentrated in vacuo. The residue was purified by silica column chromatography (20 cm column, ethyl acetate/hexane, from 1/6 to 1/4) followed by recrystallization from ethyl acetate/hexane to afford 88 mg (61%) of 3-methyl-5-[3-[4-(5-methyl-1,2,4-oxadiazol-3-yl)-2,6-dimethylphenoxy]propyl]-1,2,4-thiadiazole, as a white crystalline solid, m.p. 67°-71° C.

Provenance & Evidence