作者:Alois Fürstner、Thorsten Dierkes、Oliver R. Thiel、Gaetano Blanda
DOI:10.1002/1521-3765(20011217)7:24<5286::aid-chem5286>3.0.co;2-g
日期:2001.12.17
the catalyst which bears an imidazol-2-ylidene ligand. The EIZ ratio obtained in this macrocyclization reaction was determined by the protecting groups at the remote phenolic OH group of the cyclization precursor. The elaboration of the resulting cycloalkene 37 into the final target involved a CrCl2-mediated synthesis of vinyliodide 49 which, after deprotection, did undergo a copper-catalyzed cross-coupling
据报告,有效的细胞毒性海洋天然产物水杨酰卤酰胺A和B的简明全合成(Ia,B)。我们方法的关键步骤是[[((S)-BINAP)Ru-Cl2] 2催化的β-酮酯18和32的不对称氢化反应。NEt 3和大环内酯核的环化反应通过使用“第二代”钌卡宾配合物24作为带有咪唑-2-亚甲基配体的催化剂通过闭环烯烃复分解(RCM)进行。在该大环化反应中获得的EIZ比率由环化前体的远端酚羟基上的保护基确定。将生成的环烯烃37精制为最终靶标涉及CrCl2介导的碘乙烯49的合成,该保护基在脱保护后确实经过了铜催化的与(Z,