Synthesis of Highly Functionalized Chiral Nitriles by Radical Fragmentation of β-Hydroxy Azides. Convenient Transformation of Aldononitriles into 1,4- and 1,5-Iminoalditols
作者:Rosendo Hernández、Elisa I. León、Pilar Moreno、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1021/jo049026p
日期:2004.11.1
The synthesis of highly functionalized nitriles by an alkoxyl radical fragmentation of cyclic β-hydroxy azides is described. The alkoxyl radicals were generated by reaction of the alcohols with (diacetoxyiodo)benzene and iodine under mild conditions compatible with the presence of sensitive substituents and the protective groups most frequently used in carbohydrate chemistry. To explore the scope and
描述了通过环β-羟基叠氮化物的烷氧基自由基断裂来合成高度官能化的腈。烷氧基是通过醇与(二乙酰氧基碘)苯和碘在与敏感取代基和碳水化合物化学中最常使用的保护基团相容的温和条件下反应生成的。为了探究这种方法的范围和限制,进行实验使用各种碳水化合物的β羟基的叠氮化物的(1 - 6,33,和41),单萜(21和22),和类固醇(23 - 25)天然产品系列。特别令人感兴趣的是aldopentonitriles(15 - 18,34,和42)和aldotetrononitriles(19和20从相应的2-叠氮基-2- deoxycarbohydrates合成)。为了证明这些醛腈作为手性合成子的多功能性,制备了多羟基吡咯烷和-哌啶型的1,4-亚氨基-1-脱氧糖(37)和1,5-亚氨基-1-脱氧糖(43)类似物。