Factors Influencing 1,4-Asymmetric Induction during Indium-Promoted Coupling of Oxygen-Substituted Allylic Bromides to Aldehydes in Aqueous Solution
作者:Leo A. Paquette、George D. Bennett、Adnan Chhatriwalla、Methvin B. Isaac
DOI:10.1021/jo970158a
日期:1997.5.1
operation of chelation effects during oxidative addition of the metal into the carbon-bromine bond, but not during the coupling stage. Once the aldehyde enters into the coordination sphere of the indium, internal chelation to the proximal oxygen is disrupted and conformational restrictions are released. These effects, in combination with the absence of a powerful steric control element in the latter