Controlled Heterocyclization/Cross-Coupling Domino Reaction of β,γ-Allendiols and α-Allenic Esters: Method and Mechanistic Insight for the Preparation of Functionalized Buta-1,3-dienyl Dihydropyrans
作者:Benito Alcaide、Pedro Almendros、Teresa Martínez del Campo、M. Teresa Quirós、Elena Soriano、José L. Marco-Contelles
DOI:10.1002/chem.201300774
日期:2013.10.11
Starting from β,γ‐allendiols and α‐allenic acetates, a chemo‐ and regiocontrolled palladium‐catalyzed methodology has provided access to enantiopure 3,6‐dihydropyrans that bear a buta‐1,3‐dienyl moiety. Thus, it has been demonstrated for the first time that the preparation of six‐membered heterocycles through cross‐coupling reactions of two different allenes can be accomplished. These heterocycliz
Chemo- and Regioselective Palladium-Catalyzed Oxycyclization Reactions of Allendiols: Preparation of Five-, Six-, and Eight-Membered Cycles
作者:Benito Alcaide、Pedro Almendros、Rocío Carrascosa、Teresa Martínez del Campo
DOI:10.1002/chem.200802675
日期:2009.3.2
Positive discrimination: Chemo‐ and regioselective palladium‐catalyzed cycloetherification of allendiols, namely β,γ‐ and γ,δ‐allendiols, may occur by judicious choice of palladium‐catalyzed conditions owing to their potential ability to discriminate between both nucleophilic sites (see scheme).