Convergent Total Synthesis of Paecilomycin B and 6′-<i>epi</i>-Paecilomycin B by a Barbier-Type Reaction Using 2,4,6-Triisopropylphenyllithium
作者:Kiyomi Ohba、Masaya Nakata
DOI:10.1021/acs.joc.7b03041
日期:2018.7.6
The convergent total synthesis of the natural product paecilomycin B and its 6′-epimer was investigated. The aryl-C-glycoside skeleton was constructed by an intramolecular Barbier-type reaction using 2,4,6-triisopropylphenyllithium and subsequent deoxygenation of the resulting anomeric hydroxy group. Starting from aryl iodide 24, the addition reaction afforded the thermodynamically stable C-β macrocyclic
研究了天然产物青霉素B及其6'-表观分子的收敛全合成。芳基- Ç糖苷骨架通过使用2,4,6- triisopropylphenyllithium和所得异头羟基的后续脱氧分子内巴尔比埃型反应构建。从芳基碘化物24开始,加成反应以29%的产率提供热力学稳定的C- β大环加合物41a和以1%的产率提供C- α加合物41b。同时,芳基碘化物43(6'-末端为24)仅给出C- α加合物44收率达76%。还讨论了这些亲核加成反应的立体选择性。