One-Pot Enantioselective Formation of Eight-Membered Rings from Alkenyl Fischer Carbene Complexes and Ketone Enolates
作者:José Barluenga、Alejandro Diéguez、Félix Rodríguez、Josefa Flórez、Francisco J. Fañanás
DOI:10.1021/ja0264551
日期:2002.8.1
Eight-membered carbocycles with up to five new stereogenic centers are enantioselectively obtained following a one-pot procedure that involves the coupling of three components: an alkenylFischercarbenecomplex, a ketone enolate, and allyl lithium.
Tandem Asymmetric Conjugate Addition−Silylation of Enantiomerically Enriched Zinc Enolates. Synthetic Importance and Mechanistic Implications
作者:Oliver Knopff、Alexandre Alexakis
DOI:10.1021/ol026644o
日期:2002.10.1
cyclic and acyclic enones, could be trapped, quantitatively, as silyl enol ethers with TMSOTf in apolar solvents or with TMSCI and NEt3. These enantiomerically enriched silyl enol ethers were submitted to four synthetic transformations to show their synthetic utility. The zinc enolates obtained from acyclic enones were found to be configurationally stable, as shown by the stereochemistry of the silyl