Synthesis of Tetrasubstituted Alkenes through a Palladium-Catalyzed Domino Carbopalladation/CH-Activation Reaction
作者:Lutz F. Tietze、Tim Hungerland、Alexander Düfert、Ina Objartel、Dietmar Stalke
DOI:10.1002/chem.201103209
日期:2012.3.12
Helical tetrasubstituted alkenes (7) were obtained in a highly efficient way through a palladium‐catalyzed domino‐carbopalladation/CH‐activation reaction of propargylic alcohols 6 in good to excellent yields. Electron‐withdrawing‐ and electron‐donating substituents can be introduced onto the upper and lower aromatic rings. The substrates (6) for the domino process were synthesized by addition of the
螺旋四取代的烯烃(7)是通过钯催化的炔丙醇6的多米诺-卡铂钯化/ CH活化反应高效而良好地获得的。吸电子和供电子取代基可以引入到上和下芳环上。通过将锂化炔烃(20)添加到各种醛(19)中,合成了用于多米诺工艺的基材(6);此外,通过使用Noyori方法还原相应的酮,底物可对映选择性地(在95%ee中)到达。