Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides as new partners in diastereoselective radical cyclizations
摘要:
Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides have been used as new partners in diastereoselective radical cyclizations. An efficient and highly diastereoselective 6-exo-trig cyclization was observed. (C) 2003 Elsevier Ltd. All rights reserved.
Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides as new partners in diastereoselective radical cyclizations
摘要:
Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides have been used as new partners in diastereoselective radical cyclizations. An efficient and highly diastereoselective 6-exo-trig cyclization was observed. (C) 2003 Elsevier Ltd. All rights reserved.
Divergent Pd-Catalyzed and Radical Cyclizations of Nucleophilic Cyclic Enamines Derived from Functionalized Amine and Aldehyde Fragments
作者:José M. Aurrecoechea、Carlos A. Coy、Oscar J. Patiño
DOI:10.1021/jo800619m
日期:2008.7.1
Tetrahydropyridines carrying pendant halide functionality at the enamine beta-carbon have been prepared by condensation between appropriately functionalized aldehydes and a vinylogous Mannich adduct. Those enamines display divergent behavior in radical and Heck reactions. Thus, radical addition takes place in a 5-exo-trig fashion whereas Heck couplings follow a 6-endo-trig pathway. The resulting polycyclic products are obtained with high regio- and stereoselectivity.
Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides as new partners in diastereoselective radical cyclizations
Enantiopure alkylidene-1,1-bis-p-tolylsulfoxides have been used as new partners in diastereoselective radical cyclizations. An efficient and highly diastereoselective 6-exo-trig cyclization was observed. (C) 2003 Elsevier Ltd. All rights reserved.