The regio- and stereochemistry of the alkoxide-induced ring-opening of methoxymethylidene-substituted homopthalic anhydride
作者:Michael G. Hutchings、A. Margaret Chippendale、Ian Ferguson
DOI:10.1016/s0040-4020(01)86002-6
日期:1988.1
Ring-opening of methoxymethylidene-substituted homophthalic anhydride (1) by methoxide occurs by two modes. Attack at the 1-position (“benzoate” carbonyl) leads to a stable acid-ester. A combination of unambiguous syntheses and 1H- and 13C-n.m.r. spectroscopy has been used to show that this material has the “benzoate ester, acrylic acid” structure (5). This corrects the structure assignment given earlier
甲氧基亚甲基取代的高邻苯二甲酸酐(1)被甲醇的开环以两种方式发生。在1-位的进攻(“苯甲酸酯”羰基)导致稳定的酸酯。明确的合成与1 H-和13 C-nmr光谱的组合已被用来显示这种材料具有“苯甲酸酯,丙烯酸”结构(5)。这纠正了该材料先前给出的结构分配,该结构分配错误地得出“苯甲酸,丙烯酸酯”(2)的结论。由对“丙烯酸酯”羰基的攻击而产生的化合物(2)是(5)的副产物,但不稳定。它以另一种方式循环利用,得到(二氢)异香豆素型产品(15)和(16)。