Nitrogen → (S)-methyl 4-(1,3-dioxoisoindolin-2-yloxy)-2-methoxybutanoate

Participants

Reaction Steps

To a solution of (S)-methyl 4-hydroxy-2-methoxybutanoate (46b, 1.48 g, 10.0 mmol) in CH2Cl2 (25.0 mL) was added 2-hydroxyisoindoline-1,3-dione (1.63 g, 10.0 mmol) and triphenylphosphine (3.93 g, 15.0 mmol). The resultant mixture was cooled to 0° C. and diisopropylazodicarboxylate (2.95 ml, 15.0 mmol) was slowly added drop wise under N2 atmosphere. The reaction mixture was stirred at ambient temperature for 48 h. To the reaction mixture, H2O (100 mL) was added and extracted with CH2Cl2. The organic layers washed with brine. Dried over anhydrous Na2SO4, filtered and concentrated to provide yellow oil, which was purified by flash chromatography (50% EtOAc-hexane) to afford (S)-methyl 4-(1,3-dioxoisoindolin-2-yloxy)-2-methoxybutanoate (46c, 1.25 g, 42%) as light yellow oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.98-2.10 (m, 1H) 2.23-2.37 (m, 1H) 3.51 (s, 3H) 3.79 (s, 3H) 4.24 (dd, J=9.47, 3.66 Hz, 1H) 4.31-4.40 (m, 2H) 7.74-7.82 (m, 2H) 7.81-7.90 (m, 2H).

Provenance & Evidence