作者:Chiaki Kuroda、Tadashi Ueshino、Hajime Nagano
DOI:10.1246/bcsj.77.1737
日期:2004.9
6-Ethoxyfuranoeremophilane and its synthetic analogue, 4-ethoxy-4,5,6,7-tetrahydrobenzofuran, reacted with p-dimethylaminobenzaldehyde (Ehrlich's reagent) under acidic conditions in a 2:1 ratio to afford condensation products in 34% and 78% yields, respectively, 6-Hydroxyfuranoeremophilane and 4-hydroxy-4,5,6,7-tetrahydrobenzofuran afforded the same products as in the case of ethoxy derivatives, respectively
6-Ethoxyfuranoeremophilane 及其合成类似物 4-ethoxy-4,5,6,7-四氢苯并呋喃,在酸性条件下以 2:1 的比例与对二甲氨基苯甲醛(艾利希试剂)反应,得到 34% 和 78% 的缩合产物分别产生 6-Hydroxyfuranoeremophilane 和 4-hydroxy-4,5,6,7-四氢苯并呋喃,分别提供与乙氧基衍生物相同的产物。中间体 1:1 加合物不是从 6-ethoxyfuranoeremophilane 获得的,而是从合成类似物以低产率获得的。据推断,Ehrlich 试验中的有色化合物是中间体 1:1 加合物的阳离子物质,并且反应混合物中的有色中间体的浓度非常低。