New Annulations via Platinum-Catalyzed Enyne Cyclization and Cyclopropane Cleavage
作者:Cristina Nevado、Catalina Ferrer、Antonio M. Echavarren
DOI:10.1021/ol0486573
日期:2004.9.1
[reaction: see text] Oxidative ringopening of 3-oxabicyclo[4.1.0]hept-4-enes, formed by the intramolecular Pt(II)-catalyzed cyclopropanation of enol ethers by alkynes, gives oxepane derivatives. Alternatively, the acid-catalyzedopening of the cyclopropane ring leads to dihydrobenzofurans or 3,4-dihydro-2H-chromenes.
Highly diastereoselective hydrosilylations of allylic alcohols
作者:Mark G. McLaughlin、Matthew J. Cook
DOI:10.1039/c4cc00138a
日期:——
The highly syn-selective hydrosilylation of allylic alcohols was developed which, following oxidation, provided 1,3 alcohols containing two contiguous stereocentres.
Palladium(II)-catalyzed isomerization-Claisen rearrangement of 2-alkoxy diallyl ethers
作者:Cristina Nevado、Antonio M. Echavarren
DOI:10.1016/j.tet.2004.06.150
日期:2004.10
Diallyl ethers bearing an enol ether react in the presence of PdCl2 as catalyst to give α-allyl α-alkoxy ketones by selective isomerization via formal 1,2-H migration at the more substituted allyl group, followed by Claisen rearrangement. This rearrangement is also promoted by AuCl3 and IrCl3, although the yields are lower with these catalysts.