2-Aminothiazole → 5-(1-benzylpyrrolidin-2-yl)-N-(thiazol-2-yl)naphthalene-2-sulfonamide

Participants

Reaction Steps

A flask was charged with perfluorophenyl 5-(1-benzylpyrrolidin-2-yl)naphthalene-2-sulfonate (Intermediate LL, 21.5 mg, 0.040 mmol), thiazol-2-amine (4.84 mg, 0.048 mmol), and THF (403 μl) to give a clear, colorless solution. The flask was cooled in an dry ice-acetone bath for 5 min, then lithium 2-methylpropan-2-olate (1M in hexane) (89 μl, 0.089 mmol) was added dropwise. The resulting mixture was stirred for 1 min, then the flask was lowered into an ice-bath. After 1 h, the mixture was warmed to room temperature then was loaded directly onto a 5-g silica gel loading column with the aid of DCM. The column was dried under vacuum, then eluted onto a prequilibrated 12-g column with 0 to 10% MeOH/DCM to give 5-(1-benzylpyrrolidin-2-yl)-N-(thiazol-2-yl)naphthalene-2-sulfonamide (15.85 mg, 0.035 mmol, 87% yield) as an off-white solid: 1H NMR (400 MHz, DMSO-d6) δ ppm=12.97-12.23 (m, 1H), 8.51 (d, J=9.1 Hz, 1H), 8.46 (d, J=1.9 Hz, 1H), 8.09-7.96 (m, 2H), 7.83 (dd, J=2.1, 9.0 Hz, 1H), 7.69-7.61 (m, 1H), 7.29 (d, J=4.4 Hz, 4H), 7.27-7.24 (m, 1H), 7.24-7.20 (m, 1H), 6.83 (d, J=4.6 Hz, 1H), 4.16 (t, J=8.2 Hz, 1H), 3.78 (d, J=13.2 Hz, 1H), 3.15 (d, J=13.2 Hz, 1H), 3.07 (td, J=4.6, 9.1 Hz, 1H), 2.47-2.38 (m, 1H), 2.30 (q, J=8.6 Hz, 1H), 1.89-1.79 (m, 2H), 1.68-1.57 (m, 1H); m/z (ESI) 450.4 (M+H)+.

Provenance & Evidence