Convenient method for the synthesis of 2-substituted naphtho[2,3?g]indole-6,11-diones
摘要:
A convenient one-step method has been developed for the preparation of 2-substituted naphtho[2,3-g]indole-6,11-diones entailing the addition of piperidine to 1-amino-2-acetylenylanthraquinone and subsequent cyclization of the adduct with loss of the amine in the presence of dilute hydrochloric acid.
An unusual direction of the Richter synthesis. 1H-naphtho[2,3-g]indazole-6,11-diones
作者:Mark S. Shvartsberg、Irena D. Ivanchikova、Lidiya G. Fedenok
DOI:10.1016/s0040-4039(00)73485-x
日期:1994.9
Diazotization of 2-acetylenic derivatives of 1-aminoanthraquinone followed by intramolecular cyclization leads to the formation is good yields of 1H-3-acyl- or 1H-3-(1,1-dichloroalkyl)naphtho[2,3-g]indazole-6,11-diones, rather than 3-substituted 4-hydroxynahtho[2,3-h]cinnoline-7,1 2-diones, the normal Richter synthesis products.
PISKUNOV, A. V.;SHVARTSBERG, M. S., IZV. AN CCCP. CEP. XIM.,(1990) N, S. 1444-1445