Synthesis of 3-Alkyl-2,5-dimethylfuran Derivatives by Indirect Alkylation of 2,5-Dimethylfuran with Aliphatic Nitrocompounds
作者:Roberto Ballini、Giovanna Bosica、Dennis Fiorini、Guido Giarlo
DOI:10.1055/s-2001-17714
日期:——
The preparation of 3-alkyl-2,5-dimethylfuranes via indirect alkylation of 2,5-dimethylfuran is reported. Thus, primary nitroalkanes react with cis-3-hexen-2,5-dione giving a tandem Michael addition/elimination of nitrous acid, followed by chemoselective hydrogenation of the C=C double bond of the obtained enones. The Paal-Knorr reaction, performed with p-toluenesulfonic acid in diethyl ether, completes the formation of the title compounds. In this context the nitroalkane can be considered as an alkyl cation synthon.
报告了通过间接烷基化2,5-二甲基呋喃制备3-烷基-2,5-二甲基呋喃的方法。因此,初级硝基烷与顺式-3-己烯-2,5-二酮反应,产生硝酸的串联迈克尔加成/消除反应,随后对得到的烯酮的C=C双键进行选择性氢化。使用对甲基苯磺酸在二乙醚中进行的Paal-Knorr反应完成了目标化合物的形成。在这个背景下,硝基烷可以被视作烷基阳离子的合成单位。