Rather u(Ni)que: Two new CHalkenylationreactions, that is CH/CO alkenylation and decarbonylative CHalkenylation, of azoles are uniquely catalyzed by Ni/dcype. These azole alkenylationreactions are successfully applied to the convergent formal synthesis of siphonazole B.
而U(Ni)的阙:两个新的C ħ烯基化反应,即是C H / C Ò烯基和decarbonylativeÇ ħ烯基,唑类的Ni / dcype唯一地催化。这些唑烯基化反应已成功应用于虹吸管B的聚合形式合成中。
Lipophilic NHC assisted one-pot synthesis of syncarpamide analogues in aqueous medium
Lipophilic NHC catalysis in aqueous medium was reported for the synthesis of biologically relevant (a)symmetrically substituted and unsymmetrically substituted syncarpamide analogues. All the reported reactions were performed in the absence of any expensive metal salts or additives. A diverse array of syncarpamide analogues was obtained in good yields. Lipophilic NHC catalysis was also extended to
Dinuclear Zinc Catalyzed Asymmetric Spirannulation Reaction: An Umpolung Strategy for Formation of α-Alkylated-α-Hydroxyoxindoles
作者:Barry M. Trost、Keiichi Hirano
DOI:10.1021/ol300577y
日期:2012.5.18
A highlydiastereo- and enantioselective formal [3 + 2] cycloaddition of α,β-unsaturated esters and 3-hydroxyoxindoles catalyzed by a dinuclear zinc-ProPhenol complex is reported. The stereoselective Michaeladditions of 3-hydroxyoxindoles and the subsequent transesterifications afford spirocyclic δ-lactones.