A New Insight into the Stereoelectronic Control of the Pd
<sup>0</sup>
‐Catalyzed Allylic Substitution: Application for the Synthesis of Multisubstituted Pyran‐2‐ones via an Unusual 1,3‐Transposition
作者:Zbyněk Brůža、Jiří Kratochvíl、Jeremy N. Harvey、Lubomír Rulíšek、Lucie Nováková、Jana Maříková、Jiří Kuneš、Pavel Kočovský、Milan Pour
DOI:10.1002/chem.201900323
日期:2019.6.18
Pyran‐2‐ones 3 undergo a novel Pd0‐catalyzed 1,3‐rearrangement to afford isomers 6. The reaction proceeds via an η2‐Pd complex, the pyramidalization of which (confirmed by quantum chemistry calculations) offers a favorable antiperiplanar alignment of the Pd−C and allylic C−O bonds (C), thus allowing the formation of an η3‐Pd intermediate. Subsequent rotation and rate‐limiting recombination with the