4-Methylmorpholine → HCID 86670547, compound

Participants

Reaction Steps

2-amino-5-[2-(trimethylsilyl)ethynyl]benzoic acid (630 mg, 2.7 mmol, 1 eq.), HBTU (1.54 g, 4.0 mmol, 1.5 eq.), and 4-methylmorpholine (0.74 mL, 6.7 mmol, 2.5 eq.) were added, in order, to DMF (10 mL) and stirred at room temperature for 10 minutes. N,O-dimethylhydroxylamine hydrochloride (290 mg, 3.0 mmol, 1.1 eq.) was then added to the reaction, and the reaction was stirred at room temperature for 16 hours. Water was then added (20 mL), and the reaction was extracted three times with ethyl acetate (50 mL each). To remove residual water, saturated sodium chloride (20 mL) was added to the organic layer, and the organic layer was separated and dried over sodium sulfate. The solvent was evaporated by rotary evaporation, and the residue was purified on silica column (hexanes/ethyl acetate, 3:1) to result in 320 mg (43%) of the title compound as an orange solid. 1H NMR (500 MHz, CDCl3) δ 8.38 (d, J=1.5, 1H, Ar—H), 7.82 (dd, J=1.5, 7.5, 1H, AR—H), 7.10 (d, J=7.3, 1H, Ar—H), 5.61 (s, 2H, NH2), 4.09 (s, 3H, OCH3), 3.66 (s, 3H, NCH3), 0.22 (s, 9H, Si(CH3)3). 13C NMR (126 MHz, CDCl3) δ 169.20 (CON), 147.35 (C—Ar), 135.24 (C—Ar), 133.50 (C—Ar), 116.65 (C—Ar), 116.55 (C—Ar), 111.21 (C—Ar), 105.40 (CSi(CH3)3), 91.90 (CCSi(CH3)3), 61.44 (NOCH3), 34.53 (NCH3), 0.29 (Si(CH3)3). Exact Mass, 276.13. 277.1046 [M+H]+.

Provenance & Evidence