L-Alanine → 2-(S)-{[4-(4-Fluoro-benzyl)-1-hydroxy-3-oxo-6-trifluoromethyl-3,4-dihydro-4,4a-diaza-fluorene-2-carbonyl]-amino}-propionic acid

참여 물질

반응 단계

A mixture of 4-(4-fluoro-benzyl)-1-hydroxy-3-oxo-6-trifluoromethyl-3,4-dihydro-4,4a-diaza-fluorene-2-carboxylic acid methyl ester (compound 43 d) (100 mg, 0.23 mmol), L-alanine (205 mg, 2.3 mmol) and sodium methoxide (99 mg, 1.84 mmol) in 2-methoxyethanol (3.5 mL) was microwaved at 150° C. for 2 h and concentrated. Residue was dissolved in water (80 mL), acidified to pH=3-4 using 1 N HCl solution and extracted with EtOAc. Organic layer was washed with brine, dried over MgSO4, filtered and concentrated. Crude product was purified by silica gel chromatography (15%-70% EtOAc (with 0.075% HOAc)/hexanes (with 0.1% HOAc)) to provide the title compound 34 mg. ESI (m/z): 490.03 (M−H)−.

출처 및 근거