A new synthesis of ‘push–pull’ naphthalenes by condensation of nitro-2-methylbenzoate esters with dimethylacetamide dimethyl acetal
作者:See-Mun Wong、Bhavini Shah、Priyal Shah、Ian C. Butt、Esther C.Y. Woon、James A. Wright、Andrew S. Thompson、Christopher Upton、Michael D. Threadgill
DOI:10.1016/s0040-4039(02)00228-9
日期:2002.3
Whereas condensation of 2-methyl-3-nitrobenzoate esters with dimethylformamide dimethyl acetal gives 5-nitroisocoumarin, analogous condensation with dimethylacetamide dimethyl acetal proceeds via a different route, affording 1-methoxy-3-dimethylamino-5-nitronaphthalene in good yield. Extension of the reaction to other naphthalenes with this novel ‘push–pull’ substitution motif has been explored. A
2-甲基-3-硝基苯甲酸酯与二甲基甲酰胺二甲基乙缩醛的缩合得到了5-硝基异香豆素,与二甲基乙酰胺二甲基乙缩醛的类似缩合通过不同的途径进行,从而以良好的收率得到了1-甲氧基-3-二甲基氨基-5-硝基萘。已经探索了利用这种新颖的“推挽”取代基序将反应扩展至其他萘。氘标记研究表明,反应混合物中烷氧基的平衡发生在最后的碳环化之前。