Rhodium-Catalyzed Selective C–H Activation/Olefination of Phenol Carbamates
摘要:
Rh(III)-catalyzed ortho C-H activation/olefination of phenol carbamates has been developed. High regioselectivity is observed with a range of phenol carbamates enabling efficient coupling with acrylates and styrenes. This reaction exhibits different reactivity as compared to the Pd-catalyzed ortho-arylation reaction of phenol esters and provides a new approach for the synthesis of ortho-substituted phenols.
Rhodium(III)-Catalyzed Oxidative <i>ortho</i>-Olefination of Phenyl Carbamates with Alkenes: Elucidation of Acceleration Mechanisms by Using an Unsubstituted Cyclopentadienyl Ligand
作者:Jin Tanaka、Yuki Nagashima、Ken Tanaka
DOI:10.1021/acs.orglett.0c02499
日期:2020.9.18
It has been established that an unsubstituted cyclopentadienyl (Cp) Rh(III) complex is an effective catalyst for the oxidative ortho-olefination of phenyl carbamates with both acrylates and styrenes under mild conditions. In addition, diolefination of a protected BINOL (1,1′-binaphthalene-2,2′-diol) proceeded in high yields and disubstituted acrylates could participate in this catalysis. Experimental