ChemInform Abstract: Silver-Mediated exo-Selective Tandem Desilylative Bromination/Oxycyclization of Silyl-Protected Alkynes: Synthesis of 2-Bromomethylene-Tetrahydrofuran.
Abstract
Under optimized conditions using a slight excess of NBS in combination with AgF, mono-bromomethylene-substituted furans and pyrans are obtained with high preference over the di-bromomethylene products.