Novel synthesis of 1,3-dienes from 1-alkenes via /ldene/rd reaction with pummerer rearrangement product: a short synthesis of the sex pheromone of the red bollworm moth
A Pummererrearrangement product, 4-chlorophenylthiomethyl trifluoroacetate (6), obtained from 4-chlorophenyl methyl sulfoxide (5) and trifluoroacetic anhydride, reacted with 1-alkenes in trifluoroacetic acid to give the ene products 8, which were readily converted into the terminal 1,3-dienes 10 by oxidation and subsequent pyrolysis. Using this method, 9,11-dodecadien-1-yl acetate (12), a sex pheromone
Catalytic Enantioselective 1,2-Diboration of 1,3-Dienes: Versatile Reagents for Stereoselective Allylation
作者:Laura T. Kliman、Scott N. Mlynarski、Grace E. Ferris、James P. Morken
DOI:10.1002/anie.201105716
日期:2012.1.9
More with boron: The development of catalyticenantioselective 1,2‐diboration of 1,3‐dienes enables a new strategy for enantioselective carbonyl allylation reactions (see scheme). These reactions occur with outstanding levels of stereoselection and can be applied to both monosubstituted and 1,1‐disubstituted dienes. The carbonyl allylation reactions provide enantiomerically enriched functionalized
Up the Hill: Selective Double-Bond Isomerization of Terminal 1,3-Dienes towards Z-1,3-Dienes or 2Z,4E-Dienes
作者:Florian Pünner、Anastasia Schmidt、Gerhard Hilt
DOI:10.1002/anie.201107512
日期:2012.1.27
different cobalt catalyst systems led to the selectiveisomerization of 1,3‐dienes. In the case of the [CoBr2(py‐imine)]‐catalyzed reaction, the Z‐1,3‐diene was formed in a highly selective manner (see scheme). When the catalyst precursor [CoBr2(dpppMe2)] was applied, a double‐bond migration and selectiveisomerizationtowards the 2Z,4E‐configured 2,4‐dienes were observed
A Catalytic Enantioselective Tandem Allylation Strategy for Rapid Terpene Construction: Application to the Synthesis of Pumilaside Aglycon
作者:Grace E. Ferris、Kai Hong、Ian A. Roundtree、James P. Morken
DOI:10.1021/ja400506j
日期:2013.2.20
Catalytic enantioselective 1,2-diboration of 1,3-dienes followed by cascade allylborations with dicarbonyls provides rapid entry into carbocyclic reaction products. The stereochemical course of this reaction was studied along with its application in the synthesis of pumilaside aglycon.
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