Reactions of ring-expanded xanthines containing the imidazo[4,5-<i>e</i>][1,4]diazepine ring system
作者:Anila Bhan、Ramachandra S. Hosmane
DOI:10.1002/jhet.5570300544
日期:1993.10
corresponding amino derivative 25, followed by ring-closure with sodium meth-oxide/methanol, yielded three products, a 5:6-fused system 26 and two 5:7 fused systems 27 and 28. The structures of 26 and 27 were confirmed by single-crystal X-ray diffraction analyses. A tentative reaction pathway for the formation of all three products has been proposed. Hydrolysis of 27 with aqueous hydrochloric acid resulted in