Solvent free, light induced 1,2-bromine shift reaction of α-bromo ketones
作者:Sejin An、Da Yoon Moon、Bong Ser Park
DOI:10.1016/j.tet.2018.10.015
日期:2018.11
good product selectivity, which can be coined as 1,2-Br shift reaction. The product selectivity increases when the reaction is done in neat or solid state, where only the 1,2-Br shift product is formed in some cases. The reaction is suggested to proceed by CBr bond homolysis to give a radical pair, followed by disproportionation and conjugate addition of HBr to the α,β-unsaturatedketone intermediate
Synthesis of α,β-dibromo ketones by photolysis of α-bromo ketones with N-bromosuccinimide: Photoinduced β-bromination of α-bromo ketones
作者:Da Yoon Moon、Sejin An、Bong Ser Park
DOI:10.1016/j.tet.2019.130684
日期:2019.11
bond cleavage, elimination of HBr to give α,β-unsaturated ketone intermediates, and addition of Br2, which are formed by the reaction between HBr and NBS. From mechanistic studies of the reaction, we have also found a very convenient method for α-debromination of the α,β-dibromopropiophenones which is by simple irradiation of the dibromo ketones in acetone or 2-propanol without the use of any additives