4-(Morpholin-4-yl)benzoic acid → HCID 9835852, compound

Participants

Reaction Steps

A solution of 1-(N-t-butoxycarbonylamino)-2-aminobenzene (Method 17; 104 mg, 0.5 mmol) in DMF (1.6 ml) was added to 4-morpholinobenzoic acid (149 mg, 0.5 mmol) followed by 4-(4,6-dimethoxy-1,3,5-triazinyl-2-yl)-4-methylmorpholinium chloride (Method 18, 138 mg, 0.5 mmol) and the reaction mixture stirred at ambient temperature for 48 hours. The solvent was removed in vacuo and the resultant residue partitioned between ethyl acetate and water. The organic phase was separated, then washed with water, brine and dried over sodium sulfate then filtered. The organic extracts were concentrated by half and a 4M solution of hydrogen chloride in 1,4-dioxane (1 ml) added. The reaction mixture was stirred at ambient temperature for a further 64 hours and the resultant precipitate was collected by filtration. This solid was purified by preparative mass triggered HPLC, eluting with an increasing gradient of acetonitrile in water (which contains 5% (v/v) of a 1% (v/v) solution of formic acid in methanol) to afford the title compound (17 mg, 12%); NMR Spectrum: (DMSO-d6) 3.25 (m, 4H), 3.76 (m, 4H), 4.83 (s, 2H), 6.60 (m, 1H), 6.79 (dd, 1H), 6.96 (m, 1H), 7.01 (d, 2H), 7.16 (dd, 1H), 7.90 (d, 2H), 9.31 (brs, 1H); Mass Spectrum: M+H+ 298.

Provenance & Evidence