Enantioselective Copper(I)-Catalyzed Borylative Aldol Cyclizations of Enone Diones
作者:Alan R. Burns、Jorge Solana González、Hon Wai Lam
DOI:10.1002/anie.201205899
日期:2012.10.22
Piña colato? In the presence of a chiral CuI/bisphosphine complex and B2(pin)2, enone diones undergo diastereo‐ and enantioselective desymmetrization to deliver highly functionalized bicyclic products. The products can be used as substrates in additional transformations. pin=pinacolato, Cy=cyclohexyl.
Piñacolato?在存在手性Cu I /双膦配合物和B 2(pin)2的情况下,烯酮二酮会经历非对映异构和对映选择性去对称化,从而提供高度官能化的双环产物。该产品可用作其他转化的底物。销=松果醇,Cy =环己基。
preparation of the piperidine precursors is based on a chain elongation of a piperidine aldehyde either by aldolization or by Wittig reaction. We applied this second route to the total synthesis of quinolizidine (−)-217A from (S)-methyl 2-((S)-1-((R)-1-phenylethyl)piperidin-2-yl)propanoate 5.