tert-butyl N-(2-hydroxyethyl)carbamate → HCID 68856042, compound

Participants

Reaction Steps

2.00 g of methyl 2-hydroxy-4-methoxy-5-(3-methyl-2-butenyl)benzoate, 1.29 g of N-(t-butoxycarbonyl)-2-aminoethanol, and 2.31 g of triphephenylphosphine were dissolved in 50 ml of tetrahydrofuran. The obtained mixture was cooled on ice. Thereafter, 1.73 ml of diisopropylazodicarboxylate was added to the reaction solution at the same temperature, and the temperature was then raised to a room temperature. After completion of the reaction, the reaction solution was concentrated. The residue was purified by NH silica gel column chromatography (hexane/ethyl acetate), so as to obtain 1.54 g of methyl 2-(2-t-butoxycarbonylaminoethoxy)-4-methoxy-5-(3-methyl-2-butenyl)benzoate. The obtained product was dissolved in 15 ml of methanol, and the obtained mixture was cooled on ice. Thereafter, 10 ml of a 4 N hydrochloric acid-ethyl acetate solution was added to the reaction solution. After completion of the reaction, the reaction solution was concentrated under a reduced pressure. Ethyl acetate was added to the residue, and the obtained mixture was adjusted to be approximately pH 11 with addition of a 5 N sodium hydroxide aqueous solution and a saturated sodium bicarbonate aqueous solution. The organic layer was dried over anhydrous magnesium sulfate. After removing the drying agent by filtration, the organic layer was concentrated under a reduced pressure. 1.06 g of the obtained residue was dissolved in 20 ml of toluene, and the obtained solution was heated to reflux. After completion of the reaction, the reaction solution was concentrated. The residue was purified by silica gel column chromatography (hexane/ethyl acetate), so as to obtain 601 mg of the subject compound.

Provenance & Evidence