Water → HCID 12628430, Verbindung

Reaktionsgleichung

[Cl:1][C:2]1[CH:10]=[CH:9][C:8]2[N:7]([CH3:11])[C:6]3[C:12](=[O:21])[CH:13]=[C:14]([C:16]([O:18]CC)=[O:17])[O:15][C:5]=3[C:4]=2[CH:3]=1.O>C(O)(=O)C.Cl>[Cl:1][C:2]1[CH:10]=[CH:9][C:8]2[N:7]([CH3:11])[C:6]3[C:12](=[O:21])[CH:13]=[C:14]([C:16]([OH:18])=[O:17])[O:15][C:5]=3[C:4]=2[CH:3]=1

Komponenten

Versuchsvorschrift

A mixture of 3.5 g (0.012 mole) of ethyl 8-chloro-4,5-dihydro-5-methyl-4-oxopyrano[3,2-b]indole-2-carboxylate in 50 ml glacial acetic acid and 10 ml conc. hydrochloric acid was stirred at reflux for 3 hr, then cooled and added to 500 g ice--H2O. The crude product was filtered, washed with 50% aqueous ethanol, and air dried. A suspension of the product in 75 ml of chloroform was stirred for 90 min at room temperature, then filtered. After recrystallization twice from DMF-water, the final product was dried for several hours under high vacuum at 100°. The yellow flakes obtained had a mpt. of 290°-dec.