A Route to “all-cis” 2-Methyl-6-Substituted Piperidin-3-ol Alkaloids from syn-(2R,1′S)-2-(1-Dibenzylaminomethyl)epoxide: Rapid Total Synthesis of (+)-Deoxocassine
作者:Pierre-Yves Géant、Jean Martínez、Xavier J. Salom-Roig
DOI:10.1002/ejoc.201101333
日期:2012.1
to the synthesis of two cis-2-methyl-6-substituted piperidin-3-ols is described. syn-(2R,1′S)-2-(1-Dibenzylaminomethyl) epoxide (13) was used as common building block. The key step involved oxirane ring opening of 13 by the nucleophilic lithium aza-enolate of hydrazones 12a and 12b. Subsequent hydrazone hydrolysis and intramolecular reductive amination afforded the alkaloid (+)-deoxocassine and a new
描述了导致合成两个顺-2-甲基-6-取代的哌啶-3-醇的一般策略。syn-(2R,1'S)-2-(1-Dibenzylaminomethyl) epoxide (13) 用作常见的结构单元。关键步骤涉及腙12a和12b的亲核氮杂-烯醇锂使13的环氧乙烷开环。随后的腙水解和分子内还原胺化以良好的产率提供了生物碱 (+)-deoxocassine 和该物质的新 C-6 乙基类似物。