The first auxiliary controlled synthesis of enantiopure α,γ-substituted γ-sultones via α-allylated chiral sulfonates is described. The high asymmetric inductions of the α-allylations were reached with our previously described auxiliary 1,2:5,6-di-O-isopropylidene-α-d-allofuranose (de≥98%). Cleavage of the auxiliary and successive diastereoselective ring closure of the sulfonic acid intermediates led to the title compounds in high selectivities (de, ee≥98%) and good to excellent yields (52-90%). Enantiopure α,γ-substituted γ-sultones are interesting intermediates in the reaction with various nucleophiles.
本文描述了通过α-烯丙基化手性
磺酸盐对对映纯的α,γ-取代的γ-
琥珀酸内酯进行首次辅助控制合成。通过我们之前描述的辅助1,2:5,6-二-O-异亚丙基-α-d-
呋喃糖(de≥98%),实现了α-烯丙基化的高不对称诱导。辅助剂的裂解和
磺酸中间体的连续非对映选择性环闭合,以高选择性(de, ee≥98%)和良好至极佳的产率(52-90%)获得了标题化合物。对映纯的α,γ-取代的γ-
琥珀酸内酯是与各种亲核试剂反应的有趣中间体。