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.
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.
Preparation and reactions of 2-benzenesulphonyltetrahydropyran
作者:Steven V. Ley、Barry Lygo、Anne Wonnacott
DOI:10.1016/s0040-4039(00)61931-7
日期:1985.1
LEY, S. V.;LYGO, B.;WONNACOTT, A., TETRAHEDRON LETT., 1985, 26, N 4, 535-538
作者:LEY, S. V.、LYGO, B.、WONNACOTT, A.
DOI:——
日期:——
Alkylation reactions of anions derived from 2-benzenesulphonyl tetrahydropyran and their application to spiroketal syntiesis
作者:Steven V. Ley、Barry Lygo、Francine Sternfeld、Anne Wonnacott
DOI:10.1016/s0040-4020(01)87660-2
日期:1986.1
Deprotonation of (1) follwed by alkylation with carbonyl compounds or halides gave cyclic enol ether addition products by spontaneous elimination of benzenesulphinic acid. Interception of the initial addition products with aldehydes by reductive desulphonylation to give alkylated tetrahydropyran derivatives proeeeded in moderate yield using sodium naphthalenide. Several of the cystic enol ether addition products