terminal alpha-stannyl bromide or xanthate functionalities are prepared. Alpha-stannyl radicals generated from these acylsilanes undergo intramolecularcyclizations to give cyclic silyl enol ethers regiospecifically. The radical processes involve radical cyclization, Brook rearrangement, and beta-fragmentation in sequence. A tributylstannyl group serves as the radical leaving group. The newly formed
Intramolecular cyclizations of α-stannyl radicals to acylsilanes: regiospecific syntheses of five-membered cyclic silyl enol ethers
作者:Yeun-Min Tsai、Sheng-Yueh Chang
DOI:10.1039/c39950000981
日期:——
α-Stannyl radicals generated from acylsilanes 5, 13 and 14 cyclize to give good yields of cyclic silyl enol ethers after sequential cyclizations, radical Brook rearrangements and β-scissions.