The regioselective copper-catalyzedaddition of sp³ C-H bonds adjacent to an oxygen atom to various alkynes has been accomplished under mild reactions conditions in the presence of tert-butyl hydroperoxide to give the corresponding alkenylated products. C-Hactivation - copper - addition reactions - alkynes - tert-butyl hydroperoxide
Peroxide-Free Co(OAc)2-Catalyzed Radical Addition of sp3 C–H Bonds to Alkynes
作者:Wanzhi Chen、Min Zhang、Yun Zhao
DOI:10.1055/s-0036-1588909
日期:——
Abstract Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional radical initiators, and leads to 2-vinyl ether derivatives in good yields. Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional
Aldehydes were efficiently transformed into allylic dioxolanes by a Wittig-type reaction, using 1,3-dioxolan-2-yl-methyltriphenylphosphonium bromide under phase transfer conditions. The substituent kinetic effects were studied, and related to Hammett values and electrochemical potentials. (C) 1998 Elsevier Science Ltd. All rights reserved.