作者:Sankar Basak、Uli Kazmaier
DOI:10.1002/ejoc.200800519
日期:2008.8
Isomerization-free reactions of dienyl carbonates with chelated amino acid ester enolates at –78 °C provide important information concerning the mechanism of these dienylations. The formation of regioisomeric products can be explained by competing SN2/SN2′ reactions, and the product distribution can be influenced by the proper choice of the reaction conditions. Chiral allylic substrates show a significant
碳酸二烯基酯与螯合氨基酸酯烯醇化物在 –78 °C 下的无异构化反应提供了有关这些二烯基化机制的重要信息。The formation of regioisomeric products can be explained by competing SN2/SN2′ reactions, and the product distribution can be influenced by the proper choice of the reaction conditions. 手性烯丙基底物显示出显着的手性转移。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)