(R)-Roche ester and (S)-glycidol as chirons, the synthesis involved a highly syn-selective Lewis acid catalyzed 6-endo-trig cyclization for the construction of the dihydropyran subunit. The lactone segment was built through a tandem NaOMe conjugate addition-lactonization reaction, and further functionalized through a sequence consisting of iodination, I−Mg exchange, and hydroxymethylation. Other key steps in
抗真菌聚酮化合物jerangolid A的第一个全合成已经完成。与容易获得的(起始- [R)-Roche酯和(小号) -
缩水甘油作为chirons中,合成所涉及的高顺式-选择性
路易斯酸催化6-内- trig的环化的二氢
吡喃亚基的结构。内酯链段是通过串联的NaOMe共轭加成-内酯化反应构建的,并通过由
碘化,I-Mg交换和羟甲基化组成的序列进一步官能化。合成中的其他关键步骤以基于膦酰胺阴离子的烯烃化和Julia-Kocienski反应的新颖应用为特色。