Chemistry Letters, Vol.36, No.1, 66-67, 2007
W(CO)(5)(L)-catalyzed cyclization of omega-acetylenic silyl enol ethers for the preparation of nitrogen-containing cyclic compounds
Electrophilic alkyne activation of nitrogen-containing 7-siloxy-6-en-1-ynes by W(COML) allows the preparation of synthetically useful heterocycles. Two types of cyclized products, 5-exo and 6-endo, could be obtained selectively under the appropriate conditions.