General synthesis of 1-oxaspiro[4.5]decan-2-ones and 1-oxaspiro[4.5]decanes from 5-methylene-2(5H)-furanone
摘要:
5-Methylene-2(5H)-furanone underwent Diels-Alder cycloadditions to butadiene and several acyclic and cyclic C-substituted dienes, respectively, affording bicyclic and tricyclic spiroadducts in good yields. These compounds are precursors of other unsaturated and saturated spirolactones and also spiroethers, which were obtained through simple chemical reactions, i.e., hydrogenation of C-C double bonds, reduction of the carbonyl group, and Michael addition. The synthesis of 32 spirolactones and eight spiroethers illustrates the scope and efficiency of this method. Many of these products are suitable for use as components of perfumes and aromas owing to their olfactive properties.
General synthesis of 1-oxaspiro[4.5]decan-2-ones and 1-oxaspiro[4.5]decanes from 5-methylene-2(5H)-furanone
作者:Daniel Alonso、Josep Font、Rosa M. Ortuno
DOI:10.1021/jo00019a019
日期:1991.9
5-Methylene-2(5H)-furanone underwent Diels-Alder cycloadditions to butadiene and several acyclic and cyclic C-substituted dienes, respectively, affording bicyclic and tricyclic spiroadducts in good yields. These compounds are precursors of other unsaturated and saturated spirolactones and also spiroethers, which were obtained through simple chemical reactions, i.e., hydrogenation of C-C double bonds, reduction of the carbonyl group, and Michael addition. The synthesis of 32 spirolactones and eight spiroethers illustrates the scope and efficiency of this method. Many of these products are suitable for use as components of perfumes and aromas owing to their olfactive properties.
5-Methylene-2(5H)-furanone in Diels-Alder reactions with cyclic dienes: endo/exo selectivity
作者:Daniel Alonzo、Vicen¢ Branchadell、Josep Font、Antonio Oliva、Rosa M. Ortuño、Francisco Sánchez-Ferrando
DOI:10.1016/s0040-4020(01)86771-5
日期:——
Endo/exo selectivity in the reactions of 5-methylene-2(5)-furanone, 1, with cyclicdienes has been investigated. Both the kinetic and theoretical studies of the cycloaddition between and cyclopentadiene have permitted to explain the observed selectivity as a direct consequence of a kinetic control over the process.