Regioselective incorporation of CO into enamines by rhodium-catalyzed reaction with a hydrosilane and CO
摘要:
In the presence of [RhCl(CO)2]2, the reaction of enamines with a hydrosilane and carbon monoxide (140-degrees-C, 50 atm of CO) resulted in regioselective incorporation of CO into the alpha-carbon atom to give alpha-(siloxymethylene) amines, which can be easily converted into alpha-siloxy ketones by hydrolysis.
Reaction of Enamines with Acetals or Trialkyl Orthoformates Activated by Lewis Acids
作者:Osamu Takazawa、Kunio Kogami、Kazuo Hayashi
DOI:10.1246/bcsj.57.1876
日期:1984.7
Enamines, prepared readily from various carbonyl compounds, react with acetals or trialkyl orthoformates in the presence of Lewis acids such as BF3·OEt2 to give corresponding β-alkoxy carbonyl compounds or α-dialkoxymethyl carbonyl compounds in good yields. The reaction of dienamines with acetals or trialkyl orthoformates also selectively gives corresponding β,γ-unsaturated α-(α-alkoxyalkyl) carbonyl compounds
In the presence of [RhCl(CO)2]2, the reaction of enamines with a hydrosilane and carbon monoxide (140-degrees-C, 50 atm of CO) resulted in regioselective incorporation of CO into the alpha-carbon atom to give alpha-(siloxymethylene) amines, which can be easily converted into alpha-siloxy ketones by hydrolysis.