Oxidatively Intercepting Heck Intermediates: Pd-Catalyzed 1,2- and 1,1-Arylhalogenation of Alkenes
作者:Dipannita Kalyani、Melanie S. Sanford
DOI:10.1021/ja0782798
日期:2008.2.1
communication describes the development of two Pd-catalyzed reactions for the arylchlorination of diverse α-olefins by oxidatively intercepting Heck intermediates. Depending on the nature of the oxidant and the reaction conditions, these transformations can afford synthetically useful 1,1- or 1,2-arylchlorinated products in good yields and with good to excellent selectivities. Preliminary mechanistic
Palladium-Catalyzed 1,1-Aryloxygenation of Terminal Olefins
作者:Andrew D. Satterfield、Asako Kubota、Melanie S. Sanford
DOI:10.1021/ol103121r
日期:2011.3.4
This paper describes the 1,1-arylacetoxylation of diverse α-olefins using organostannanes and hypervalent iodine oxidants. The reaction provides a convergent approach for generating a C−C and a C−O bond as well as a new stereocenter in a single catalytic transformation.
Palladium-Catalyzed Oxidative Arylhalogenation of Alkenes: Synthetic Scope and Mechanistic Insights
作者:Dipannita Kalyani、Andrew D. Satterfield、Melanie S. Sanford
DOI:10.1021/ja101851v
日期:2010.6.23
This article describes the development of a Pd-catalyzed reaction for the arylhalogenation (halogen = Cl or Br) of diverse alpha-olefins by oxidatively intercepting Mizoroki-Heck intermediates. These transformations afford synthetically useful 1,2- and 1,1-arylhalogenated products in good yields with good to excellent selectivities that can be modulated by changing the nature of the halogenating reagent and/or the reaction conditions. The selectivity of these reactions can be rationally tuned by (i) controlling the relative rates of oxidative functionalization versus beta-hydride elimination from equilibrating Pd-II-alkyl species and (ii) stabilization of organometallic Pd-II intermediates through the formation of pi-benzyl adducts. These arylhalogenations exhibit modest to excellent levels of stereoselectivity, and the key carbon-halogen bond-forming step proceeds with predominant retention of stereochemistry at carbon.