Author/Authors :
Yamamoto، نويسنده , , Hirofumi and Nishiyama، نويسنده , , Mami and Imagawa، نويسنده , , Hiroshi and Nishizawa، نويسنده , , Mugio، نويسنده ,
Abstract :
Mercuric triflate was shown to be a powerful catalyst for the cyclization of alkynyl tert-butylcarbonates giving rise to cyclic enol carbonates under mild conditions. Internal alkynyl carbonate affords endo cyclization product selectively, while terminal alkynyl carbonate provides only exo cyclization product.
