Synthesis and reactivity of novel π-allylcyclopentadienyl cobaltolactone complexes
作者:Steven D. R. Christie、Christophe Cosset、David R. Hamilton、William J. Kerr、John M. O'Callaghan
DOI:10.1039/c39950002051
日期:——
A range of novel cobaltolactone complexes are prepared under photolytic conditions from dicarbonylcyclopentadienylcobalt and vinyl epoxides; their subsequent reactivity under a selected series of reaction conditions is described.
Vinylepoxides as Versatile Substrates for Allylations of Amino Acids and Peptides
作者:Uli Kazmaier、Sarah Thies
DOI:10.1055/s-0029-1218536
日期:2010.1
Vinyl epoxides are excellent substrates for Pd-catalyzed allylic alkylations of chelated enolates. Nucleophilic attack on the predominantly formed syn/syn Ï-allyl complexes occurs regioselectively at the distal position. The E-configured product is formed preferentially, depending on the substitution pattern and the reaction conditions used.
Synthesis of (<i>E</i>)-α,β-Unsaturated Carbonyls<i>via</i>Silver-Catalyzed Tandem Epoxide Rearrangement/Intermolecular Carbonyl- Heteroalkyne Metathesis
stereoselective method for the synthesis of (E)‐α,β‐unsaturated carbonyls has been developed via a silver‐catalyzed tandem epoxide rearrangement/intermolecular carbonyl‐heteroalkyne metathesis. Various heteroalkynes including ynol ethers, ynamides, and thioalkynes work well for this transformation, leading to the production of (E)‐α,β‐unsaturatedesters, amides, and thioesters in moderate to excellent
Tandem Meinwald Rearrangement-Fischer
Indolisation: A One-Pot Conversion of Epoxides into Indoles
作者:Richard Taylor、James Donald
DOI:10.1055/s-0028-1087476
日期:——
A tandem Sc(OTf)3-mediated Meinwald epoxide rearrangement-Fischer indole synthesis is reported. Optimisation and scope and limitation studies are described. In addition, preliminary investigations to develop a telescoped epoxidation-Meinwald rearrangement-Fischer indole sequence are outlined.
Probing the Effect of Allylic Substitution on Cyclic Ammonium Ylid Rearrangements
作者:J. Sweeney、Julien Sançon
DOI:10.1055/s-0029-1219348
日期:2010.3
The [2,3]-sigmatropic rearrangement of tetrahydropyridine-derived ammonium ylids is a valuable method for the preparation of substituted pyrrolidine carboxylates. The presence of an allylic substituent does not intrinsically reduce the yield of rearrangements, and the diastereoselectivity of rearrangement is related to the structure of the diazo reactant. The method represents a very rapid means of