Simple Designs for the Construction of Complex Trans-Fused Polyether Toxin Frameworks. A Convergent Strategy Based on Hydroxy Ketone Cyclization of C-Linked Oxacycles
作者:Eleuterio Alvarez、Ricardo Pérez、Milagros Rico、Rosa M. Rodríguez、Julio D. Martín
DOI:10.1021/jo950547+
日期:1996.1.1
A single, unified convergent strategy for the stereocontrolled synthesis of trans-fused polyethers was developed. It was demonstrated that the epimerization and reductive intramolecular coupling of hydroxy ketones in reactions with silane-Lewis acids (SI-LA) to generate ethers in C-linked oxacycles is affected by its conformational preference in a predictable manner. The obtained results make evident
开发了单一,统一的聚合策略,用于立体控制合成反式融合聚醚。结果表明,羟基酮与硅烷-路易斯酸(SI-LA)反应生成C-连接的氧杂环化合物中的醚,其差向异构化和还原性分子内偶联受其构象偏好的影响可预测。所得结果表明,半iketaltal羟基和1,3-双轴CO键之间的氢键的影响是规则的和可预测的,并且在热力学下驱动环闭合成恶烷环时,可以自信地进行反式稠合聚醚的收敛合成。条件