Phosphine-Free Palladium-Catalyzed Allene Carbopalladation/Allylic Alkylation Domino Sequence: A New Route to 4-(α-Styryl) γ-Lactams
作者:Claire Kammerer、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1002/chem.200900184
日期:2009.4.20
γ‐lactams are synthesized in 61–88 % yield by a phosphine‐free palladium‐catalyzed carbopalladation/allylicalkylationdominosequence (see scheme). The cyclization is totally regio‐ and diastereoselective in favor of the 3,4‐trans‐disubstituted γ‐lactam. The process is successfully applied to the synthesis of a new aza analogue of the naturally occurring lignan (+)‐oxo‐parabenzlactone.