Cularine and Related Compounds. V. Investigation of the Ullmann Reaction Products of Methyl (2-Bromo-4, 5-dimethoxyphenyl) acetate with Phenolic Compounds, and an Approach to the Total Synthesis of Cularine.
作者:Tetsuji Kametani、Keiichiro Fukumoto、Shiroshi Shibuya、Takuo Nakano
DOI:10.1248/cpb.11.1299
日期:——
Preparation of the cyclic amide (II) as the key intermediate for the synthesis of cularine was elaborated. Bischler-Napieralski cyclization of this amide appeared to proceed as expected to give the desired isoquinoline derivative, didehydronorcularine, in a crude state, which, however, was readily oxidized and turned during purification into the corresponding ketone derivative, which was characterized as its picrate.
详细阐述了环状酰胺(II)作为合成环烷的关键中间体的制备。该酰胺的比什勒-纳皮尔环化反应似乎按预期进行,以粗制状态产生了所需的异喹啉衍生物二脱氢去甲环烷,但该物质极易氧化,在纯化过程中转化为相应的酮衍生物,其特征是苦味酸。