An efficient method for the synthesis of sulfones via nitrogen loss of sulfonyl hydrazones is described. The reaction was performed in the presence of simple copper salt and base by utilization of sulfonyl hydrazones, which were easily prepared from carbonyl compounds. A wide variety of aryl and alkyl sulfones were obtained in moderate to good yields.
arylsulfonyl radicals with diazo compounds is described for the synthesis of various arylsulfones under mild conditions. In this reaction, the cheap, environmentally friendly, and readily available inorganic K2S2O5 is employed as the sulfur dioxide source for providing arylsulfonyl radicals. In addition, a radical mechanism involving the insertion of sulfur dioxide with aryl radicals followed by the coupling
描述了一种新型铜催化的芳基磺酰基与重氮化合物的交叉偶联,用于在温和条件下合成各种芳基砜。在该反应中,使用廉价、环保且易于获得的无机 K 2 S 2 O 5作为二氧化硫源来提供芳基磺酰基自由基。此外,提出了一种自由基机理,包括将二氧化硫插入芳基自由基,然后将芳基磺酰基自由基与铜卡宾偶联。
Palladium-catalyzed benzylic direct arylation of benzyl sulfones with aryl halides
作者:Takashi Niwa、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1016/j.tet.2009.01.030
日期:2009.3
An effective palladium catalyst system for the direct arylation of benzyl sulfones with aryl halides has been developed. The catalytic reaction provides a facile route to diarylmethyl sulfones. The products can be transformed further via desulfonylative functionalization mediated by aluminum compounds. (C) 2009 Elsevier Ltd. All rights reserved.