Synthesis and the Spectral Analysis of 4- and 6-[1-Acetamido-3-(3,4,5-trimethoxyphenyl)propyl]-2-methoxytropones(B-Ring-open Analogues of Colchicine)
作者:Hiroshi Yamamoto、Atsushi Hara、Saburo Inokawa、Tetsuo Nozoe
DOI:10.1246/bcsj.56.3106
日期:1983.10
The treatment of 4-[1-acetamido-3-(3,4,5-trimethoxyphenyl)propyl]tropolone with ethereal diazomethane gave the 6- and 4-substituted title compounds in 51 and 38% yields, respectively. The 270-MHz 1H-NMR spectral analysis performed on these compounds, colchicine, and two methyl ethers of hinokitiol permits unequivocal assignment of the position of the C-substituent on these 2-methoxytropone rings. Attempts were made to effect the direct B-ring closure of these intermediates and 4-[1-acetamido-3-(3,4,5-trimethoxyphenyl)propyl]-5-aminotropolone using various oxidizing reagents.
以4-[1-乙酰胺基-3-(3,4,5-三甲氧基苯基)丙基]托烷酮为原料,与乙醚二甲基甲烷反应,分别得到了6-取代和4-取代的目标化合物,产率为51%和38%。对这些化合物、秋水仙碱以及两个硫靑醇甲醚进行了270 MHz的1H-NMR光谱分析,明确了这些2-甲氧基托烷酮环上C-取代基的位置。尝试使用各种氧化剂直接实现这些中间体和4-[1-乙酰胺基-3-(3,4,5-三甲氧基苯基)丙基]-5-氨基托烷酮的B环闭合。