indole‐based biaryls with bromoalkyl alkynes by using palladium/norbornene (Pd/NBE) cooperative catalysis. This reaction is realized through a sequence of Catellani‐type C−H alkylation, alkyneinsertion, and indole dearomatization, by forming twoC(sp2)−C(sp3) and one C(sp2)−C(sp2) bonds in a single chemical operation, thus providing a diverse range of pentacyclic molecules, containing a spiroindolenine fragment
Highly Chemoselective Construction of Spiro[4,5]decane-Embedded Polycyclic Scaffolds by a Palladium/Norbornene-Catalyzed C–H Activation/Arene Dearomatization Reaction
with bromoalkyl alkynes has been successfully developed by palladium/norbornene catalysis. This domino process was accomplished by following a cascade of Catellani-type C–H functionalization, alkyne migratory insertion, and arene dearomatization, thus leading to a large number of spiro[4,5]decane-embedded polycyclic molecules bearing various functional groups in moderate to excellent yields.
The versatile role of norbornene in C–H functionalization processes: concise synthesis of tetracyclic fused pyrroles via a threefold domino reaction
作者:Kersten M. Gericke、David I. Chai、Mark Lautens
DOI:10.1016/j.tet.2008.01.146
日期:2008.6
The synthesis of novel tetracyclic fused pyrrolesfrom 1-(2-iodophenyl)-1H-pyrrole and various bromoalkyl-aryl alkynes via a palladium(0)-catalyzed and norbornene-mediated threefold domino reaction is reported. PdCl2 and tri-2-furylphosphine (TFP) in the presence of norbornene and Cs2CO3 in CH3CN at 90 °C gave a variety of tetracyclic fused pyrroles in usually high yields. In the described reaction
报道了通过钯(0)催化和降冰片烯介导的三重多米诺反应,由1-(2-碘苯基)-1 H-吡咯和各种溴代烷基-芳基炔烃合成新型四环稠合吡咯。在降冰片烯和Cs 2 CO 3在90°C的CH 3 CN中存在时,PdCl 2和三-2-呋喃基膦(TFP)可以通常以高收率得到各种四环稠合吡咯。在所描述的反应顺序中,三个碳-碳键中的两个是通过未活化的芳基C-H键的官能化形成的。