The tungsten-η3-2-substituted pentadienyl complexes WC5H5(CO)2(syn-η3-R-C5H6)(R = COOMe; CMeCH2) undergo BF3-catalysed stereoselective carbon-carbon bond formation with aldehydes to afford isolable s-trans-diene cations which after hydrolysis produces tungsten-η3-allyl-1,3-diols; utilization of the diols for stereoselective synthesis of α-methylene-γ-butyrolactones, furanone skeletons, have been reported in good yields (> 80%).
钨-δ-3-2-取代
戊二烯络合物 WC5H5(CO)2(syn-δ-3-R-
C5H6)(R = COOMe;CMeCH2)在
BF3 催化下与醛发生立体选择性碳-碳键形成,生成可分离的 s-反式二烯阳离子,
水解后生成
钨-δ-3-烯丙基-1,3
-二醇;据报道,利用这些二醇立体选择性合成δ-亚甲基δ
-丁内酯和
呋喃酮骨架的产率很高(> 80%)。