Generation of sulfur ylides by the desilylation of α-trimethylsilylbenzyl sulfonium salts
作者:Albert Padwa、John R. Gasdaska
DOI:10.1016/s0040-4020(01)86662-x
日期:1988.1
The [2,3]-sigmatropic rearrangement of sulfur ylides derived via the desilylation of several α-trimethylsilylbenzyl sulfonium salts has been studied. The initially formed ylide was found to rapidly equilibrate with the thermodynamically more stable ylide. In the absence of trapping reagents, a Sommelet-Hauser type rearrangement occurs.
A Sommelet–Hauserrearrangement of sulfonium ylides of 4H-pyran-4-ones, furan, and thiophenes are discussed. The sulfonium halides which were prepared from excess dimethyl sulfide with corresponding halides were treated with NaH or NaOR in a polar solvent to give moderate to good yields of rearranged products.
讨论了 4H-吡喃 4-酮、呋喃和噻吩的锍叶立德的 Sommelet-Hauser 重排。由过量二甲硫与相应卤化物制备的锍卤化物在极性溶剂中用 NaH 或 NaOR 处理,得到中等至良好收率的重排产物。
YAMAMOTO, MAKOTO;KAKINUMA, MADOKA;KOHMOTO, SHIGEO;YAMADA, KAZUTOSHI, BULL. CHEM. SOC. JAP., 62,(1989) N, C. 958-960