New Approach to the Stereoselective Synthesis of Metalated Dienes via an Isomerization−Elimination Sequence
摘要:
Treatment of Cp2ZrBu2 with enol ether containing a remote double bond lead to conjugated metalated diene as single isomer via a tandem isomerization-elimination sequence. 2-Arylsulfonyl 1,3-dienes can also be used as a source of dienyl zirconocene derivatives, and the stereochemistry of the diene is dependent on the transmetalation reaction.
New Approach to the Stereoselective Synthesis of Metalated Dienes via an Isomerization−Elimination Sequence
作者:Nicka Chinkov、Swapan Majumdar、Ilan Marek
DOI:10.1021/ja027027y
日期:2002.9.1
Treatment of Cp2ZrBu2 with enol ether containing a remote double bond lead to conjugated metalated diene as single isomer via a tandem isomerization-elimination sequence. 2-Arylsulfonyl 1,3-dienes can also be used as a source of dienyl zirconocene derivatives, and the stereochemistry of the diene is dependent on the transmetalation reaction.
Stereoselective Preparation of Dienyl Zirconocene Complexes via a Tandem Allylic C−H Bond Activation-Elimination Sequence
作者:Nicka Chinkov、Swapan Majumdar、Ilan Marek
DOI:10.1021/ja036751t
日期:2003.10.1
zirconocene derivatives were easily prepared, as unique geometrical isomers, from simple non-conjugated unsaturated enolethers with (1-butene)ZrCp2 complexes. This new methodology is based on a tandem allylic C-H bond activation-elimination sequence and the mechanism has been mapped out by deuterium labeling experiments. The stereochemical outcome of this process was determined by addition of several electrophiles