反应详情

To a solution of N,N-dimethylaminoacetyl chloride hydrochloride (137, 10.1 g, 64.2 mmol) in acetonitrile (300 ml.) was added powdered sodium bicarbonate (11.9 g, 141 mmol) followed by 4-aminobenzoic acid (138, 9.68 g, 70.6 mmol). The mixture was vigorously stirred over 16 h at r.t. and acetonitrile was decanted. The remaining gum was triturated with methanol and filtration afforded the title compound 139 (10.9 g, 76% yield). 1H NMR: (400 MHz, DMSO-d6) δ(ppm): 10.21 (s, 1H), 7.84 (d, J=8.4 Hz, 2H), 7.76 (d, J=8.6 Hz, 2H), 4.17 (bs, 2H), 2.27 (s, 6H). LRMS: (m/z): 223.3 (MH+).

1. customacetonitrile was decanted
2. filtrationThe remaining gum was triturated with methanol and filtration