Synthesis and Reactions of 2-Arylhydrazinotropones. I. Preparation of 2-(2-Arylhydrazino)tropones and the 4-Substituted Derivatives
作者:Tetsuo Nozoe、Kimiaki Imafuku、Bing-Zhu Yin、Masaaki Honda、Yasutomo Goto、Yasushi Hara、Takayoshi Andoh、Hiroshi Yamamoto
DOI:10.1246/bcsj.61.2531
日期:1988.7
group at the 5-position, 4-substituted 2-(2-arylhydrazino)tropones were obtained as the major products by the abnormal substitution reaction. These 2-(2-arylhydrazino)tropones are expected to effectively serve as precursors for a convenient synthesis of 5-aryl-substituted tropolones via benzidine-type rearrangement. 1H NMR (200 or 500-MHz) parameters for these 4-substituted 2-(2-arylhydrazino)tropones
通过 2-甲苯磺酰氧托酮与芳基肼反应制备了多种 2-(2-芳基肼基) 托酮。二聚化合物 6,6'-双(芳基肼基)-1,1'-双(2,4-环庚二烯)-7,7'-二酮、2-苯胺托酮和 3-(2-芳基肼基)托酮被分离为在某些情况下是次要产品。类似地,以 2-tosyloxytropones 开始,在 5-位带有异丙基、异丙烯基、(1-乙酰氨基乙基)和受保护的乙酰基,通过异常取代获得 4-取代的 2-(2-芳基肼基)tropones 作为主要产物反应。预计这些 2-(2-芳基肼基) 托酚酮可有效地用作通过联苯胺型重排方便合成 5-芳基取代的托酚酮的前体。