Highly regioselective gold-catalyzed formal hydration of propargylic <i>gem</i>-difluorides
作者:Jean-Denys Hamel、Tatsuru Hayashi、Mélissa Cloutier、Paul R. Savoie、Olivier Thibeault、Meggan Beaudoin、Jean-François Paquin
DOI:10.1039/c7ob02406a
日期:——
Herein, we report a highlyregioselective gold-catalyzed formal hydration of propargylic gem-difluorides. Not only does this transformation provide access to versatile fluorinated building blocks that were difficult or hardly possible to access beforehand, but it also represents a rare case of a highlyregioselective gold-catalyzed hydroalkoxylation of internal alkynes and puts forward the utility
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