Ethyl Acetate → (3-Amino-7,8-dihydro-naphtho[2,3-b]furan-2-yl)-(2,4-dichloro-phenyl)methanone

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 3-hydroxy-5,6-dihydro-naphthalene-2-carbonitrile from step 1 (100 mg, 0.58 mmol) and 2,4-dichlorophenacyl chloride (144 mg, 0.64 mmol, 1.1 eq) in anhydrous N,N-dimethylformamide (2 mL) was added potassium carbonate (161 mg, 1.2 mmol, 2 eq). The reaction mixture was shaken at 90° C. for 17 h. The mixture was cooled to room temperature and poured into ethyl acetate and water. Separated the organic phase and extracted the aqueous layer with ethyl acetate twice. Combined the ethyl acetate extracts and the original organic layer and evaporated in vacuo. The crude product was purified by HPLC and gave 39.4 mg (14% for two steps) of (3-Amino-7,8-dihydro-naphtho[2,3-b]furan-2-yl)-(2,4-dichloro-phenyl)-methanone as a brown oil. 1H-NMR (acetone-d6) δ 7.63 to 7.61 (m, 2H), 7.59 (s, 1H), 7.52 to 7.54 (m, 1H), 7.13 (s, 1H), 7.04 (broad, s, 2H), 6.59 (tt, J=10 Hz, 1.2 Hz, 1H), 6.07 (m, 1H), 2.92 (t, J=8.0 Hz, 2H), 2.33 (m, 2H); MS LC-MS (MH+=358.1/360.1); Rf=0.51, 30% ethyl acetate-hexane.

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