Molecular Rearrangement of 9b-Hydroxy-1<i>H</i>-imidazo[4,5-<i>c</i>]quinoline-2,4-diones - A Convenient Pathway to Spiro-Linked Imidazolidine-Oxindole Derivatives
作者:Antonín Klásek、Antonín Lyčka、Ivan Mikšík、Aleš Růžička
DOI:10.1002/hlca.200800338
日期:2009.4
Abstractmagnified imageThe 1‐substituted 3‐alkyl/aryl‐3‐aminoquinoline‐2,4(1H,3H)‐diones 1 react with alkyl/aryl isocyanates to give novel 3‐alkyl/aryl‐3‐ureidoquinoline‐2,4(1H,3H)‐diones (=N‐(3‐alkyl/aryl‐1,2,3,4‐tetrahydro‐2,4‐dioxoquinolin‐3‐yl)ureas) 2 and/or 3a‐alkyl/aryl‐3,3a,5,9b‐tetrahydro‐9b‐hydroxy‐1H‐imidazo[4,5‐c]quinoline‐2,4‐diones 3 in high yields. Compounds 2 and 3 rearrange by boiling in AcOH or concentrated HCl solution to give three different types of spiro[imidazolidine‐4,3′‐[3H]indole]‐2,2′(1′H)‐diones, i.e., 10, 11, and 12, depending on the kind of substituents at C(3) and C(3a), respectively. All compounds were characterized by 1H‐ and 13C‐NMR and IR spectroscopy as well as by atmospheric‐pressure chemical‐ionization (APCI) mass spectra. The structures of compounds 11c and 12Al were investigated by single‐crystal X‐ray diffraction analysis.