The use of a mixture of dl- and meso-divinylethylene carbonate as an electrophile in palladium-catalyzed asymmetric allylic alkylation reactions is reported. From the diastereomeric mixture of meso and chiral racemic starting materials, a single product is obtained in high optical purity employing either oxygen or nitrogen nucleophiles. The resulting dienes have proven to be versatile synthetic intermediates
据报道,在
钯催化的不对称烯丙基烷基化反应中,使用
碳酸dl-和间-二
乙烯基碳酸亚
乙酯的混合物作为亲电子试剂。从内消旋和手性外消旋起始材料的非对映异构体混合物中,使用氧或氮亲核试剂可得到高光学纯度的单一产物。事实证明,生成的二烯是通用的合成中间体,因为每个碳都经过官能化以进一步转化,并通过反应进行区分。提出了这种令人感兴趣的转化的机制,并且报道了简明的(+)-澳式碱性盐酸盐的对映选择性全合成以及异甲内酯的正式合成。