Ammonium Hydroxide → Ethyl 2-amino-2-methyl-4-oxo-4-p-tolylbutanoate

Participants

Reaction Steps

To a solution of Intermediate 102A (1.067 g, 4.59 mmol) in DMSO (20 mL) under argon was added NH4OH (18.04 mL, 271 mmol) and the reaction mixture was stirred at rt overnight. The reaction mixture was diluted with EtOAc (75 mL) and washed sequentially with water (40 mL) and brine (20 mL). The organic phase was dried over MgSO4 and concentrated in vacuo to give a yellow oil. The oil was purified by silica gel chromatography (120 g silica gel) to provide the desired product (0.632 g, 55%) as a clear oil. LCMS Anal. Calc'd for C14H19NO3 249.14, found [M+H] 250.1. 1H NMR (500 MHz, CDCl3) δ 7.83 (d, J=8.25 Hz, 2H), 7.24 (d, J=7.98 Hz, 2H), 4.14 (dd, J=7.15, 2.75 Hz, 2H), 3.65 (d, J=17.61 Hz, 1H), 3.20 (d, J=17.61 Hz, 1H), 2.40 (s, 3H), 2.18-2.27 (m, 2H), 1.39 (s, 3H), 1.19 (t, J=7.01 Hz, 3H).

Provenance & Evidence