Reaction of (ethoxycarbonylfuryl)methanephosphonates with diethyl carbonate in presence of sodium foil
作者:L. M. Pevzner
DOI:10.1134/s1070363214070159
日期:2014.7
conjugated with the carbanion center of 2-furylmethanephosphonate, addition of the carbanion to the carbonyl group of diethyl carbonate takes place to give 2-furylacetic acid derivatives in high yield. Sodium salts of these CH-acids are synthesized, isolated, and characterized. Their alkylation with alkyl bromoacetates is carried out. If ethoxycarbonyl group is not conjugated with the carbanion center, conversion
研究了钠箔存在下(乙氧基羰基呋喃基)甲烷膦酸酯与碳酸二乙酯的反应。结果表明,如果酸化基团与2-呋喃基甲烷膦酸酯的碳负离子中心共轭,则将碳负离子加到碳酸二乙酯的羰基上可以高产率地得到2-呋喃基乙酸衍生物。合成,分离和表征这些CH-酸的钠盐。用溴乙酸烷基酯进行它们的烷基化。如果乙氧羰基不与碳负离子中心共轭,则起始膦酸酯的转化率和加合物的产率急剧降低。在用碳酸二乙酯酰化之后,立即将烷基(2-和4-乙氧基羰基糠-3-基)甲烷膦酸酯用碳酸二乙酯钠系统还原,以形成烷基1-(2-和4-乙氧基羰基糠-3-基)乙烷膦酸酯。中间还原产物的形成,磷酸化的呋喃基乙醛也经光谱固定。与起始膦酸酯和1-(3-呋喃基)乙烷膦酸酯烷基酯的酯基的还原脱烷基同时发生,得到羧酸盐。(2-甲基-5-乙氧基羰基呋喃-3-基)甲烷膦烷基酯不参与缩合反应。它仅产生在碳酸二乙酯形成的乙醇酸钠作用下的脱烷基化产物。与起始膦酸酯和1-(3-呋