A general method for the synthesis of β-substituted and unsubstituted cycloheptenones bearing enantioenriched all-carbon γ-quaternary stereocenters is reported. Hydride or organometallic addition to a seven-membered ring vinylogous ester followed by finely tuned quenching parameters achieves elimination to the corresponding cycloheptenone. The resulting enones are elaborated to bi- and tricyclic compounds with potential for the preparation of non-natural analogs and whose structures are embedded in a number of cycloheptanoid natural products.
报道了一种合成含有手性富集的全碳γ季碳中心的β取代及未取代的
环庚烯酮类化合物的一般方法。通过向七元环烯醇酯进行
氢化物或有机
金属加成,并精细调控猝灭参数,实现了向相应
环庚烯酮的消除反应。所得的烯
酮类化合物可进一步构建双环和
三环化合物,具有制备非天然类似物的潜力,其结构嵌入在多种
环庚烷类
天然产物中。