3-Amino-4-chloropyridine → 5-(4-Methyl-5-trifluoromethyl-isoxazol-3-yl)-thiophene-2-carboxylic acid (4-chloro-pyridin-3-yl)-amide

Beteiligte Stoffe

Reaktionsschritte

A solution of 3-amino-4-chloropyridine (129 mg, 1.0 mmol) in THF (2 mL) was treated with solid 5-(4-methyl-5-trifluoromethyl-isoxazol-3-yl)-thiophene-2-carbonyl chloride (148 mg, 0.5 mmol, as prepared in Example 2 Method B) and allowed to stir for 1 hr. The reaction was then evaporated and the residue chromatographed on silica gel with EtOAc/hexanes (70%) as eluant to afford product as a colorless solid (31 mg, 16%). 1H NMR (CDCl3) 2.39 (d, J=1.5, 3 H), 7.39 (d, J=5.3, 1 H), 7.56 (d, J=7.56, 4.1, 1 H), 7.72 (d, J=4.1, 1 H), 8.22 (s, 1 H), 8.33 (d, J=4.7, 1 H), 9.61 (s, 1 H). 13C NMR 8.0, 114.8, 118.7 (q, J=271), 129.0, 129, 7, 132.9, 134.6, 140.5, 143.8, 146.1, 157.7, 159.0, 19F NMR −63.1. LC/MS 6.34 min, [M+1]+ 388.

Herkunft & Nachweise