Asymmetric Cyclization of ω-Formyl-1,3-dienes Catalyzed by a Zerovalent Nickel Complex in the Presence of Silanes
作者:Yoshihiro Sato、Nozomi Saito、Miwako Mori
DOI:10.1021/jo020438c
日期:2002.12.1
A nickel(0)-catalyzed asymmetriccyclization of omega-formyl-1,3-diene in the presence of silanes in which five- or six-membered carbocycles or pyrrolidine derivatives were afforded up to 86% ee by the use of (2R,5R)-2,5-dimethyl-1-phenylphospholane as a monodentate chiral ligand was investigated. The reaction course of this asymmetriccyclization can be explained for by two possible mechanisms: one
Ni(0)-Catalyzed Bismetallative Cyclization of 1,3-Diene and a Tethered Aldehyde in the Presence of Bu<sub>3</sub>SnSiMe<sub>3</sub>
作者:Yoshihiro Sato、Nozomi Saito、Miwako Mori
DOI:10.1246/cl.2002.18
日期:2002.1
Ni(0)-Catalyzed bismetallative cyclization of 1,3-diene and a tethered aldehyde in the presence of Me3SiSnBu3 gave the corresponding cyclized product, having an allylstannyl group in the side chain, which could be used as an allylstannane in a coupling reaction with benzaldehyde.
Ni(0)-Catalyzed bismetallative cyclization of 1,3-diene and a tethered aldehyde in the presence of Me3SiSnBu3 给出了相应的环化产物,其侧链中含有一个烯丙基锡基,可在与苯甲醛的偶联反应中用作烯丙基锡烷。
A Novel Asymmetric Cyclization of ω-Formyl-1,3-dienes Catalyzed by a Zerovalent Nickel Complex in the Presence of Silanes
作者:Yoshihiro Sato、Nozomi Saito、Miwako Mori
DOI:10.1021/ja994059l
日期:2000.3.1
A Highly Stereoselective Sequential Allylic Transfer Reaction of Diene with Diboronyl Reagent and Aldehydes Promoted by Nickel Catalyst
作者:Chan-Mo Yu、Jinsuop Youn、Seok-Keun Yoon、Young-Tack Hong
DOI:10.1021/ol051806c
日期:2005.9.1
graph A new protocol for the sequential allylic transfer reaction of a diene with two aldehydes in the construction of cyclic systems containing four stereogenic centers is achieved in a one-pot operation. Reaction of the diene-alehyde 1 with aldehyde in the presence of the diboronyl reagent catalyzed by a nickel complex produces products 2 and 3 depending on reaction conditions in high levels of diastereoselectivity. Extension of this method to the synthesis of six-membered rings is also investigated.