Synthesis and Photochemical Investigations of Tetrasubstituted Alkenes as Molecular Switches-The Effect of Substituents
作者:Lutz F. Tietze、M. Alexander Düfert、Tim Hungerland、Kawon Oum、Thomas Lenzer
DOI:10.1002/chem.201003559
日期:2011.7.18
Molecular switches based on helical tetrasubstituted alkenes, substituted with either electron‐withdrawing (CF3, F, CN; 2 a–c, 3 a,c) or ‐donating substituents (Me, OMe; 2 d,e), have been synthesized from acyclic precursors 4 and 5 in a domino carbopalladation/Stille reaction. This palladium‐catalyzed process allowed the rapid assembly of two CC bonds, two six‐membered rings, and the tetrasubstituted
合成了基于螺旋四取代烯烃的分子开关,这些分子被吸电子(CF 3,F,CN; 2 a – c,3 a,c)或给体取代基(Me,OMe; 2 d,e)取代在多米诺骨腕/ Stille反应中由无环前体4和5合成。此钯催化的过程允许的两个C快速组装C键,两个六元环和完全取代的非对映选择性方式的四取代双键。通过交替照射两个不同的波长区域,研究了取代基对整个转换过程的电子效应。尽管取代基对吸收最大值的影响很小,但观察到开关行为的巨大差异。