A conceptually new regioselective and highly syn-stereoselective intermolecular Friedel–Crafts-type O-alkylation of phenols with aryl epoxides by the use of appropriately substituted aryl borates is reported. The carbon–carbon bond formation occurs in neutral and mild conditions without the need for external Lewis acids or transition metal catalysts.
Reactivity of Functionalized Arylcarbenes. 2-Phenylethyl Side Chains and Hetero Analogues
作者:Wolfgang Kirmse、Wolfgang Konrad、Ismail S. Özkir
DOI:10.1016/s0040-4020(97)00338-4
日期:1997.7
reactions with β-C-H bonds were observed, pointing to a triplet abstraction-recombination mechanism. Large kinetic and stereochemical deuterium isotope effects support this notion. The ample formation of benzocyclobutenes from 2-CH2-X-Ph substrates is due to insertion of the carbenes into ArCH2-X bonds. Addition to the terminal phenyl groups competes with C-H and C-X insertion. The results of benzophenone