A new, wide ranging, synthetically powerful, catalytic tandem cyclisation-anion capture process is proposed which depends on the rate of cyclisation of an organopalladium specifies (RPdX) onto a proximate alkene or diene being significantly faster than anion exchange and reductive elimination in the sequence RPdX → RPdY → RY + Pd(0). The catalytic cyclisation - anion capture sequence is illustrated
Diastereo- and regioselective palladium–indium bimetallic cyclisation–Barbier-type allylation cascades
作者:Ian R. Cooper、Ronald Grigg、William S. MacLachlan、Visuvanathar Sridharan、Mark Thornton-Pett
DOI:10.1016/s0040-4039(02)02428-0
日期:2003.1
A new diastereo-and regioselective Pd In bimetallic cascade process which assembles three contiguous chiral centres is described. Pd(0)-catalysed cyclisation of aryl iodides onto proximate 1,3-dienes generates pi-allylpalladium(II) species, transmetallation with indium and subsequent Barbier-type addition to aldehydes affords heterocyclic homoallylic alcohols. (C) 2002 Elsevier Science Ltd. All rights reserved.