Hydrochloric Acid → HCID 45141330, compound

Participants

Reaction Conditions

Reaction Steps

The amine 8 (0.30 g, 1.18 mmol) and oxime ether 13a (0.126 g, 0.534 mmol) were mixed with concentrated hydrochloric acid (7 mL) and the mixture was stirred at 100° C. for 18 h. The reaction mixture was cooled and washed with ether (3×20 mL). It was then brought to basic pH with NH4OH. The mixture was extracted with chloroform (40 mL×3) and the solution was washed with brine (50 mL), dried (Na2SO4) and concentrated. The residue was diluted in chloroform (40 mL) and filtered. Hydrochloric acid (2 M HCl in ether, 5 mL) was added to the filtrate. The precipitate that formed was recrystallized from methanol to provide a yellow solid. The solid was dissolved in water, basified with NH4OH and extracted with chloroform. The organic layer was concentrated to dryness. The residue was purified by preparative flash chromatography (SiO2, methanol-chloroform-TEA=3:97:2) to afford the final product 14a as a light yellow solid (0.0162 g, 7.8%): mp 205-207° C. IR (KBr) 2940, 1449, 1408, 1326, 1246, 1159, 1061 cm−1; 1H NMR (300 MHz, CDCl3) δ 8.98 (s, 1H), 7.62 (s, 1H), 7.23 (s, 1H), 7.16 (s, 1H), 6.11 (s, 2H), 4.21 (s, 2H), 4.10 (s, 3 H), 4.05 (s, 3H), 2.77 (s, 6H); low resolution ESIMS m/z (rel intensity) 379 (MH+, 100), 334 (90). Anal. (C22H22N2O4.1.25H2O) C, H, N.

Provenance & Evidence