Intramolecular reductive coupling of cycloalkanones tethered to alkynoates in the presence of (η2-propene)titanium was successfully performed to provide hydroxy-esters in a diastereoselective manner. Subsequent lactonization afforded angularly fused unsaturated tricyclic lactones which represent relevant substructures of numerous bioactive compounds.
分子内还原偶联反应在(Λη²-
丙烯)
钛催化剂作用下成功地应用于与炔酸酯连接的环烷酮,以高对映选择性方式合成了羟基酯。随后的内酯化反应得到了角融合的不饱和
三环内酯,这些结构是许多
生物活性化合物的相关子结构。