Tetrahydrofuran → (R)-8-(2-amino-2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)ethyl)-2-(4-methyl-5-oxo-2,5-dihydrofuran-3-yl)-2,8-diazaspiro[4.5]decan-1-one

Participants

Reaction Steps

To a solution of (R)-8-(2-azido-2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)ethyl)-2-(4-methyl-5-oxo-2,5-dihydrofuran-3-yl)-2,8-diazaspiro[4.5]decan-1-one (250 mg, 0.54 mmol) in a mixed solvent of tetrahydrofuran and water (v:v, 12:1, 20 mL) was added triphenylphosphine (283 mg, 1.08 mmol) under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 18 h. The solvent was removed by evaporation and the residue was purified by preparative TLC (dichloromethane: methanol=10:1) to afford the title compound. 1H NMR (400 MHz, Methanol-d4): δ 7.80 (d, J=8.0 Hz, 1H), δ 7.66 (d, J=8.0 Hz, 1H), 5.40 (s, 2H), 5.24 (s, 2H), 4.73 (dd, J=4.0 Hz, 8.8 Hz, 1H), 4.09 (t, J=6.8 Hz, 2H), 3.30-3.21 (m, 1H), 2.98-2.91 (m, 1H), 2.87-2.81 (m, 1H), 2.70-2.66 (m, 1H), 2.55-2.47 (m, 2H), 2.40 (s, 3H), 2.18-2.07 (m, 4H), 2.00 (s, 3H), 1.74-1.68 (m, 2H). MS-ESI (m/z): 440 (M+1)+.

Provenance & Evidence