Triphenylphosphine → HCID 69152362, Verbindung

Beteiligte Stoffe

Reaktionsschritte

To 2,2,2-trichloroethyl 4-bromo-1-methyl-1H-pyrazol-3-ylcarbamate (2.402 g, 6.83 mmol), 4-methoxybenzyl 2-hydroxy-4-methylpentanoate (3.45 g, 13.67 mmol) and triphenyl phosphine (3.58 g, 13.67 mmol) in dry DMF (50 mL) under dry nitrogen was added dropwise diisopropyl azodicarboxylate (2.7 mL, 13.67 mmol) over 45 minutes and the reaction mixture stirred for 2 days. Water was added and the product extracted with ether (2×), dried over Na2SO4, concentrated in vacuo and purified by flash chromatography over silica gel (EtOAc/Hex, 2/8) to afford 4-methoxybenzyl N-(4-bromo-1-methyl-1H-pyrazol-3-yl)-N-[(2,2,2-trichloroethoxy)carbonyl]leucinate.

Herkunft & Nachweise