Ethyl formate → HCID 44466107, compound

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Reaction Steps

(Z)-2-(3,5-Dimethylisoxazol-4-yl)-N′-hydroxy-1-(4-hydroxyphenyl)-1H-indole-3 carboximidamide (Example 11) was dissolved in THF containing 4-Å powdered molecular sieves. The mixture was stirred for 30 min under N2. NaH (60% dispersion in mineral oil, 7.0 mg, 2.1 eq,) was added and the mixture was stirred at 60° C. for 20 min. After cooling to room temperature, ethyl formate (25.6 mg, 2.5 eq) in THF was added dropwise. The resulting mixture was heated at reflux for 1 h and then cooled to room temperature. The mixture was filtered and concentrated. The residue was filtered through silica and then purified using reversed phase HPLC to give 4-(2-(3,5-dimethylisoxazol-4-yl)-3-(1,2,4-oxadiazol-3-yl)-1H-indol-1-yl)phenol as a white powder: ES/MS m/z: 395.17 (M−H), 393.19 (M−H); 1H NMR (acetone-d6, 500 MHz): 9.21 (s, 1H), 8.40 (m, 1H), 7.37-7.31 (m, 2H), 7.26-7.22 (m, 3H), 6.98 (m, 2H), 2.17 (s, 3H) and 1.98 (s, 3H).

Provenance & Evidence