Synthesis of Axially Chiral 1,2,3-Triazol-5-ylidene–Au(I) Complex and Its Application in Enantioselective [2 + 2] Cycloaddition of Alleneamides with Alkenes
作者:Wei Huang、You-Can Zhang、Rui Jin、Bai-Ling Chen、Zili Chen
DOI:10.1021/acs.organomet.8b00524
日期:2018.9.24
of which, significant Ag(I)–Ag(I) bonding existed. The crystal structures of (R)-8a, (R)-8f, and (R)-8g were also obtained, which exhibit an axially chiral bis(MIC)-bis(Au) structure without Au(I)–Au(I) interaction. Application of these axially chiral bis-/mono- 1,2,3-triazol-5-ylidene Au(I) complexes in the enantioselective [2 + 2] cycloaddition of alleneamides 10a with p-methoxy styrene 11a were explored
一系列轴向手性的双1,2,3-三唑-5-亚甲基Au(I)配合物(R)-8a – g和一个单1,2,3-三唑-5-亚烷基Au(I)配合物(- [R )-图9a是从市售的(制备- [R )联萘-2,2-二胺(BINAM)化合物,其中,双的转移金属化(MIC) -双[银(I)]的中间体为相应的金(I配合物被用作关键的合成步骤。通过在铜催化的叠氮化物-炔烃环加成(CAAC)步骤中使用不同的炔烃试剂,可以使这些MIC–Au(I)配合物的结构多样化。三种手性双-1,2,3-三唑-5-亚烷基Ag(I)配合物(R)-7a,(R)-7c和(R)-7d均已制备并充分表征。根据(R)-7a的晶体结构,显示出手性四(MIC)-双(Ag)结构,其中两个手性双-1,2,3-三唑-5亚叉基配体由两个几乎线性银原子桥,其中存在显着的Ag(I)–Ag(I)键。(R)-8a,(R)-8f和(R)-8g的晶体结构还获得了具有轴