1,2-Cycloheptanedione → 2,4-Dichloro-7,8,9,10-tetrahydrocyclohepta[b]indol-6(5H)-one

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Cycloheptane-1,2-dione (1 g, 7.9 mmol) was dissolved in MeOH (25 mL) and (2,4-dichlorophenyl)hydrazine hydrochloride (1.86 g, 8.7 mmol) in AcOH—HCl (3.5:1, 45 mL) was added and heated to 60° C. for 18 h. MeOH was removed in vacuo, the reaction mixture was basified with aqueous NaHCO3 (pH-8) and then extracted with EtOAc (3×25 mL), The combined organic extracts were dried over Na2SO4 and concentrated under reduced pressure to give the crude product which was purified by silica gel chromatograph [EtOAc-hexane (9:1) as eluant] to give the title compound (0.2 g, 9.4%). 1H NMR (200 MHz, CDCl3, δ in ppm) 9.0 (br s, 1H), 7.54 (d, J=1.6 Hz, 1H), 7.33 (d, J=1.8 Hz, 1H), 3.11 (t, J=12.0 Hz, 2H), 2.90 (t, J=11.8 Hz, 2H), 2.13-2.20 (m, 4H).

Herkunft & Nachweise