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.
A new heterocyclization in the series of acetylenic derivatives of anthraquinone
作者:M. S. Shvartsberg、I. D. Ivanchikova、L. G. Fedenok
DOI:10.1007/bf01431813
日期:1996.7
Abstract2-Alkynyl-l-amino-9,10-anthraquinones react with HNO2 in a mixture of dilute HCl and dioxane at 20 °C to give I , 1-dichloroalkyl- IH-3-naphto[2,3-g]indazole-6,1 1 -diones. This reaction differs from the known cylization ofortho-alkynylbenzenediazonium salts involving the formation of a pyridazine ring (the Richter synthesis of 4-hydroxy- and 4-halocinnolines).
摘要 2-炔基-1-氨基-9,10-蒽醌在稀盐酸和二恶烷的混合物中在 20 °C 下与 HNO2 反应生成 I, 1-二氯烷基-IH-3-萘并[2,3-g]吲唑- 6,1 1-二酮。该反应不同于已知的邻-炔基苯重氮盐的环化,涉及形成哒嗪环(4-羟基-和4-卤代吲哚啉的Richter合成)。