Asymmetric Synthesis of a Hydroxylated Nine-membered Lactone from Tartaric Acid using the Claisen Rearrangement
作者:Leon S.-M. Wong、Kathleen A. Turner、Jonathan M. White、Andrew B. Holmes、John H. Ryan
DOI:10.1071/ch09637
日期:——
The synthesis of a hydroxylated vinyl-appended lactone, in five synthetic steps from tartaric acid, is reported. The C2-symmetrical bis-vinyl diol 12 was converted into the ketene acetal 14 via methylenation of the cyclic carbonate 13 or thermal elimination of benzeneselenenic acid from the selenoxide 17. In both cases, the in situ generated ketene acetal 14 underwent spontaneous Claisen rearrangement
据报道,由酒石酸通过五个合成步骤合成了羟基化的带有乙烯基的内酯。通过环状碳酸酯13的亚甲基化或从亚硒酸盐17中热去除苯硒酸,将C 2对称的双乙烯基二醇12转化为乙烯酮缩醛14。在这两种情况下,原位生成的乙烯酮缩醛14都进行了自发的Claisen重排,得到了九元内酯(+)- 15。这类内酯是简化的eleutherobin类似物或其他中环内酯天然产物的潜在高级前体。