Enantioselective Synthesis of 5-Alkylated Thiazolidinones via Palladium-Catalyzed Asymmetric Allylic C–H Alkylations of 1,4-Pentadienes with 5<i>H</i>-Thiazol-4-ones
作者:Tian-Ci Wang、Zhi-Yong Han、Pu-Sheng Wang、Hua-Chen Lin、Shi-Wei Luo、Liu-Zhu Gong
DOI:10.1021/acs.orglett.8b01697
日期:2018.8.17
A palladium-catalyzed, enantioselective allylic C–H alkylation of 1,4-pentadienes with 5H-thiazol-4-ones has been developed. Under the cooperative catalysis of a palladium complex of chiral phosphoramidite ligand and an achiral Brønsted acid, a broad range of substituted 5H-thiazol-4-ones bearing sulfur-containing tertiary chiral centers were accessed from the allylic C–H alkylation in high levels
1,4-戊二烯与 5 H -thiazol-4-ones 的钯催化、对映选择性烯丙基 C-H 烷基化已被开发出来。在手性亚磷酰胺配体的钯配合物和非手性布朗斯台德酸的协同催化下,从高水平的烯丙基 C-H 烷基化中获得了范围广泛的带有含硫叔手性中心的取代 5 H-噻唑-4-酮。产率和对映选择性。烷基和芳基 1,4-戊二烯分别产生直链和支链烯丙基化产物。