Reaction Steps
Prepared using General Procedure 15: To a stirred solution of (R)-5-(3-(1-amino-2,3-dihydro-1H-inden-4-yl)-1,2,4-oxadiazol-5-yl)-2-isopropoxybenzonitrile 49 (20.0 mg, 0.05 mmol) in DMF (1 mL) was added DIEA (19.4 mg, 0.15 mmol) and methyl chloroformate (9.5 mg, 0.1 mmol) for 4 h at room temperature. The solvent was evaporated and the residue was dissolved in DMSO (1 mL) and purified by preparative HPLC to afford 2.35 mg (11%) of (R)-methyl (4-(5-(3-cyano-4-isopropoxyphenyl)-1,2,4-oxadiazol-3-yl)-2,3-dihydro-1H-inden-1-yl)carbamate 149. LCMS-ESI (m/z) calculated for C23H22N4O4: 418.2; found 419.1 [M+H]+, tR=3.85 min. 1H NMR (400 MHz, CDCl3) δ 8.39 (d, J=2.1 Hz, 1H), 8.32 (dd, J=8.9, 2.2 Hz, 1H), 8.07 (d, J=7.6 Hz, 1H), 7.54-7.44 (m, 1H), 7.38 (t, J=7.6 Hz, 1H), 7.12 (d, J=9.0 Hz, 1H), 5.43-5.18 (m, 1H), 5.03 (d, J=8.6 Hz, 1H), 4.90-4.63 (m, 1H), 3.77 (d, J=27.4 Hz, 3H), 3.59-3.35 (m, 1H), 3.27-3.01 (m, 1H), 2.68 (ddd, J=12.7, 8.2, 4.7 Hz, 1H), 2.05-1.75 (m, 1H), 1.47 (t, J=5.6 Hz, 6H). 13C NMR (101 MHz, DMSO) δ 167.82, 163.56, 157.51, 151.63, 139.77, 137.77, 128.85, 128.63, 123.19, 122.08, 121.53, 117.97, 111.55, 110.03, 108.32, 98.67, 51.00, 46.99, 28.68, 26.28, 24.46, 16.50.
