A route to biaryl-3-carboxylate esters involving a radical 1,2-aryl migration has been developed. This strategy hinges on the radical addition of xanthate 2 to olefin 1 causing a 1,2-aryl shift leading to alpha,beta-unsaturated ester 5, which is then converted into biaryl 10 by treatment with DBU under microwave heating.
A route to biaryl-3-carboxylate esters involving a radical 1,2-aryl migration has been developed. This strategy hinges on the radical addition of xanthate 2 to olefin 1 causing a 1,2-aryl shift leading to alpha,beta-unsaturated ester 5, which is then converted into biaryl 10 by treatment with DBU under microwave heating.
Radical-Based Route to 2-(Trifluoromethyl)-1,3,4-oxadiazoles and Trifluoromethyl-Substituted Polycyclic 1,2,4-Triazoles and Dihydrofurans
作者:Ling Qin、Samir Z. Zard
DOI:10.1021/acs.orglett.5b00457
日期:2015.3.20
O-Ethyl S-[5-(trifluoromethyl)-1,3,4-oxadiazol-2-yl]methyl xanthate was readily prepared on a large scale and shown to undergo very efficient intermolecular radical additions to unactivated alkenes. The products were further elaborated by exploiting both radical and ionic processes to provide a variety of trifluoromethyl-substituted derivatives, including medicinally relevant triazoles. In particular, the application of a radical allylation on the initial adducts leads to structures that are able to undergo intramolecular [4 + 2] cycloaddition reactions.
A Convergent Radical-Based Route to Biaryls
作者:Béatrice Quiclet-Sire、Guillaume Revol、Samir Z. Zard
DOI:10.1021/ol9010294
日期:2009.7.2
A route to biaryl-3-carboxylate esters involving a radical 1,2-aryl migration has been developed. This strategy hinges on the radical addition of xanthate 2 to olefin 1 causing a 1,2-aryl shift leading to alpha,beta-unsaturated ester 5, which is then converted into biaryl 10 by treatment with DBU under microwave heating.