Hydrochloric Acid → (R)-5-(5-(1-amino-2,3-dihydro-1H-inden-4-yl)oxazol-2-yl)-2-isopropoxybenzonitrile hydrochloride

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of (R)-tert-butyl 4-(2-(3-cyano-4-isopropoxyphenyl)oxazol-5-yl)-2,3-dihydro-1H-inden-1-ylcarbamate INT-42 (48 mg, 0.1 mmol) in 1,4-dioxane (1 mL) was added a 4N HCl solution in 1,4-dioxane (1 mL). The reaction mixture was heated at 55-65° C. for 48 h. The cooled reaction mixture was diluted with Et2O (10 mL). The resulting solid was collected and dried under high vacuum to yield 32 mg (78%) of (R)-5-(5-(1-amino-2,3-dihydro-1H-inden-4-yl)oxazol-2-yl)-2-isopropoxybenzonitrile hydrochloride 59 as a white solid. LCMS-ESI (m/z) calculated for C22H21N3O2: 359.4; found 343.1 [M−NH2]+, tR=2.40 min. 1H NMR (400 MHz, DMSO) δ 8.55 (br s, 2H), 8.43 (dd, J=6.5, 2.4 Hz, 1H), 8.32 (ddd, J=6.7, 6.1, 2.9 Hz, 1H), 8.00 (t, J=13.5 Hz, 1H), 7.72 (s, 1H), 7.66 (d, J=7.5 Hz, 1H), 7.49 (dd, J=8.5, 6.3 Hz, 2H), 4.93 (dt, J=12.1, 6.0 Hz, 1H), 4.81 (s, 1H), 3.43-3.25 (m, 1H), 3.23-3.04 (m, 1H), 2.67-2.55 (m, 1H), 2.11 (ddd, J=14.2, 9.0, 5.9 Hz, 1H), 1.36 (dd, J=13.8, 7.0 Hz, 6H).

Provenance & Evidence