P-Phenylenediamine → 2-(p-Aminoanilino)benzoxazole

Participants

Reaction Steps

To a solution of benzene-1,4-diamine (5.0 g) in NMP (30 ml) was added dropwise, over 0.5 h, a solution of 2-chlorobenzo[d]oxazole (6.03 g) in NMP (50 mL). After the addition was complete, the mixture was stirred at ambient temperature for 1 h. After this time, the reaction mixture was diluted with water (200 mL) and extracted with ethyl acetate (3×200 mL). The combined organic extracts were washed with brine (150 ml), dried (Na2SO4) and filtered. The filtrate was concentrated under reduced pressure. The residue obtained was purified by chromatography (silica, methylene chloride to 1:19 methanol/methylene chloride) to afford N-(1,3-benzoxazol-2-yl)benzene-1,4-diamine (9.20 g) as an off-white solid.

Provenance & Evidence