Synthesis and Reactions of 2-Arylhydrazinotropones. II. Synthesis of 5-Aryltropolones and B-Ring-Open Colchicine Analogues via Benzidine Type Rearrangement of 2-(2-Arylhydrazino)troponesa
作者:Tetsuo Nozoe、Kahei Takase、Masafumi Yasunami、Masayoshi Ando、Hiroaki Saito、Kimiaki Imafuku、Bing-Zhu Yin、Masaaki Honda、Yasutomo Goto、Tadashi Hanaya、Yasushi Hara、Hiroshi Yamamoto
DOI:10.1246/bcsj.62.128
日期:1989.1
Treatment of a wide variety of 2-(2-arylhydrazino)tropones with ethanolic acid at 50–80°C readily gave the benzidine type rearrangement products, 2-amino-5-(4-aminoaryl)tropones, besides minor amounts of byproducts of various type. The main products were conveniently led to the corresponding 5-aryltropolones. Similarly, 2-(2-arylhydrazino)tropones bearing an isopropyl and isopropenyl group at the 4-position
在 50-80°C 下用乙醇酸处理多种 2-(2-芳基肼基)托酮容易得到联苯胺型重排产物,2-氨基-5-(4-氨基芳基)托酮,以及少量副产物各种类型。主要产品可方便地生成相应的 5-芳基托酚酮。类似地,在 4-位带有异丙基和异丙烯基的 2-(2-芳基肼基)tropones 提供 4-取代的 2-氨基-5-(4-氨基芳基)tropones 作为主要产物,这也导致了 4-取代5-(4-乙酰氨基芳基)-和5-(4-甲氧基芳基)托酚酮。这些产品的结构分配是基于 1H NMR 和其他光谱数据以及化学转化为已知的 5-苯基托酚酮和 2-乙酰氨基-8-羟基-10,10-二甲基环庚[a]inden-7 (10H)-一。