crystallized as the pure (S,S,P) diastereoisomer, was determined by X-ray crystallography. Coordination of the ruthenium fragment caused an elongation of the C=S bond, a contraction of the C–O bond within the lactone ring and a flattening of that ring. Single hydride transfer with LiBEt3H converted 4a–f into the thiolactolate complexes 5a–f in good yields and diastereoselectivities. An X-ray structure determination
取代不稳定的
噻吩络合物 [CpRu(S,S)-CHIRAPHOS}(SC4H4)]BF4 (2) [(S,S)-CHIRAPHOS = (2S,3S)bis(diphenylphOSphanyl)butane],由 [CpRu (S,S)-CHIRAPHOS}Cl] (1)、
噻吩和
AgBF4 与联芳基
硫醇内酯 3a-f 反应以高产率得到相应的 S 配位配合物 4a-f。4c 的结构以纯 (S,S,P) 非对映异构体结晶,通过 X 射线晶体学确定。
钌片段的配位导致 C=S 键的伸长、内酯环内 C-O 键的收缩和该环的扁平化。LiBEt3H 的单
氢化物转移以良好的产率和非对映选择性将 4a-f 转化为
硫代乳酸配合物 5a-f。5a 的主要异构体的 X 射线结构测定表明它是 (S,S,S,P) 非对映异构体。用 NH4PF6 质子化将 5a-f 转化为相应的开环
硫醛配合物 6a-f。5a 与甲基
碘的烷基化导致