作者:M. Teresa Barros、Christopher D. Maycock、M. Rita Ventura
DOI:10.1039/b002980g
日期:——
Synthetic approaches to the powerful analgesic alkaloids (+)- and (â)-epibatidine are described. The starting material employed was natural (â)-quinic acid from which chiral enones and α-iodoenones were prepared. Stille coupling afforded suitable substrates for completion of the syntheses. A key step in this process was the diastereoselective reduction of a cyclohexanone with sodium borohydride and DMSO which sets up the stereochemistry necessary for the formation of the bicycloheptane system. The synthesis of a previously reported enone intermediate has also been improved.
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本文介绍了强效镇痛生物碱(+)-和(â)-表巴丁的合成方法。采用的起始原料是天然(â)-奎宁酸,并从中制备了手性烯酮和δ-碘烯酮。斯蒂尔偶联为完成合成提供了合适的底物。这一过程中的一个关键步骤是用硼氢化钠和二甲基亚砜对环己酮进行非对映选择性还原,从而建立了形成双环庚烷体系所需的立体化学结构。之前报道的一种烯酮中间体的合成方法也得到了改进。