K. Miura et al., SILICON-DIRECTED CYCLIZATION OF VINYLSILANES BEARING HYDROXY GROUP CATALYZED BY AN ACID, Tetrahedron letters, 36(9), 1995, pp. 1483-1486
Silicon-directed stereoselective syn addition of hydroxy group to olef
inic double bond occurs intramolecularly in an acid-catalyzed cyclizat
ion of vinylsilanes bearing hydroxy group. Thus 5-dimethylphenylsilyl-
4-penten-1-ol is smoothly cyclized to 2-(dimethylphenylsilyl)methyltet
rahydrofuran upon the treatment of a catalytic amount of p-toluenesulf
onic acid (TsOH) or TiCl4.