Stereoselective Construction of Tetrahydrofuran by Tin (IV) Chloride Promoted [3+2] Cycloaddition of Allylsilane to α-Keto Ester
SnCl4 promoted [3+2] cycloaddition reactions of allylsilane to α-keto esters afforded tri- and tetrasubstituted tetrahydrofurans with excellent stereoselectivity via 1,2-silyl migration in good yields.