Catalytic amination of silyl enol ethers with azo diester compounds was investigated. It was shown that Cu(OTf)2 or AgOTf had high catalytic activity and that AgOTf was the most efficient among the catalysts tested in the reactions. In asymmetric reactions, the AgClO4-BINAP system showed high enantioselectivity. In a mixture of toluene or mesitylene and THF, silyl enol ethers reacted with dibenzyl
Developing a transition-metal-free green protocol for the electrophilic hydrazination of silyl enol ethers using diazo electrophiles with EtOH–H<sub>2</sub>O as a safe solvent
作者:Subba Rao Polimera、Andivelu Ilangovan、Murugaiah A. M. Subbaiah
DOI:10.1039/d2gc04607e
日期:——
electrophilic hydrazination of difluoro-substituted or desfluoro silylenolethers with diazo systems as electrophiles was examined. In contrast to conventional protocols that use a metal catalyst, a HF reagent, and chlorinated or ethereal solvents and are conducted at energy-inefficient low temperatures under an inert atmosphere, the new method allows reactions to be performed under metal- and HF-free