Acetic Acid → (S)-5-(9-[(3,5-Bis-trifluoromethyl-benzyl)-(2-methyl-2H-tetrazol-5-yl)-amino]-1,3,6,7,8,9-hexahydro-2-oxa-5-aza-cyclohepta[f]inden-5-yl)-3,3-dimethyl-pentanoic acid methyl ester

Beteiligte Stoffe

Reaktionsschritte

To a solution of (S)-(3,5-bis-trifluoromethyl-benzyl)-(3,5,6,7,8,9-hexahydro-1H-2-oxa-5-aza-cyclohepta[f]inden-9-yl)-(2-methyl-2H-tetrazol-5-yl)-amine (0.195 mmol) in dichloroethane (5 mL), add 3,3-dimethyl-5-oxo-pentanoic acid methyl ester (0.585 mmol) along with a catalytic amount of acetic acid. To this stirred solution add sodium triacetoxyborohydride (0.975 mmol). After stirring for 12 h, quench the reaction with aqueous sodium carbonate (5 mL) and dilute with dichloromethane (5 mL). Dry the organic portion, filter, and remove the solvent under vacuum. Chromatograph the product over silica gel, eluting with ethyl acetate/hexane (2-35%) to afford the title compound as a colorless oil. MS (ES+): 655.2 (M+H).

Herkunft & Nachweise