Stereoselective Synthesis of Tetrasubstituted Olefins through a Halogen-Induced 1,2-Silyl Migration
作者:Nicholas T. Barczak、Douglas A. Rooke、Zachary A. Menard、Eric M. Ferreira
DOI:10.1002/anie.201303007
日期:2013.7.15
Migrating through Si valley: The highly stereoselective formation of α‐silyl‐β‐ haloenones by way of silicon group migration is described. Electrophilic activation of the alkyne by N‐halosuccinimides induced an anti‐selectivemigration to give highly substituted enones (see scheme). These enone products can be readily converted to the all‐carbon tetrasubstituted alkenes while maintaining their geometry
Stereoselective Syntheses of Trisubstituted Olefins via Platinum Catalysis: α-Silylenones with Geometrical Complementarity
作者:Douglas A. Rooke、Eric M. Ferreira
DOI:10.1021/ja1058197
日期:2010.9.1
The stereoselective syntheses of alpha-silylenones using catalytic PtCl(2) are reported. Via alkyne activation, alpha-hydroxypropargylsilanes are converted to (Z)-silylenones through a highly selective silicon migration. The complementary (E)-silylenones are accessed by a regioselective hydrosilylation of the ynone precursor. The synthetic utility of these compounds is demonstrated in cross-coupling