A New Reaction Motif: “Homo-S<sub>N</sub>2′-Like” Direct Nucleophilic Addition to Neutral η<sup>3</sup>-Allylmolybdenum Complexes. Total Synthesis of the Antimalarial (+)-Isofebrifugine
作者:Wenyong Chen、Lanny S. Liebeskind
DOI:10.1021/ja9056322
日期:2009.9.9
intermolecular "homo-S(N)2'-like" reaction with a variety of carbon nucleophiles. Combined with an annulative demetalation, the homo-S(N)2'-like substitution/annulative demetalation sequence rapidly generates 2,7-dioxabicyclo[4.3.0]nonane and 2-aza-7-oxabicyclo[4.3.0]nonane frameworks in good to excellent yields with high enantiopurity. An enantiocontrolled total synthesis of the antimalarial alkaloid (+)-isofebrifugine
电荷中性 TpMo(CO)(2)(5-acyloxy-eta(3)-pyranyl) 和 TpMo(CO)(2)(5-acyloxy-eta(3)-pyridinyl) 支架经历了一种新型的分子间“homo-S (N)2'-like" 与各种碳亲核试剂的反应。结合环状脱金属,同型 S(N)2' 样取代/环状脱金属序列快速生成 2,7-二氧杂双环 [4.3.0] 壬烷和 2-氮杂-7-氧杂双环 [4.3.0] 壬烷骨架具有高对映体纯度的良好收率。利用该反应级联实现了抗疟生物碱 (+)-isofebrifugine 的对映控制全合成。