Phosphonomethylated Acetoxymethyl Derivatives of Acetylfurans and Alkyl Furoates with Neighboring Location of Substituents: Synthesis and Following Transformations
作者:L. M. Pevzner、A. I. Ponyaev
DOI:10.1134/s1070363222090079
日期:2022.9
ring, transesterification of the phosphonate group occurs, accompanied by the destruction of P–C bond. The ester group is transesterified in any case. The resulting alcohols are oxidized by the dimethyl sulfoxide–acetic anhydride system or by the complex of chromium trioxide with pyridine to the corresponding aldehydes. The P–C bond is not affected in this case. The resulting aldoketones react with hydrazine
摘要 已经开发了乙酰呋喃和糠酸烷基酯的膦甲基化乙酰氧基甲基衍生物的合成方法,并研究了它们的甲醇分解。已经发现,由于羟甲基呋喃衍生物的高酸性,反应仅在等量的甲醇盐的情况下进行完成。如果乙酰氧基甲基和二乙氧基磷酰基占据呋喃环中的相邻位置,则会发生膦酸酯基团的酯交换,同时破坏 P-C 键。在任何情况下,酯基都被酯交换。生成的醇通过二甲亚砜-乙酸酐体系或通过三氧化铬与吡啶的络合物氧化成相应的醛。在这种情况下,P-C 键不受影响。生成的醛酮与水合肼反应生成呋喃[2,3-d ]- 或呋喃[3,4 -d ]哒嗪,取决于呋喃环中取代基的位置。在具有相似结构的醛酯的情况下,反应在腙形成阶段停止。