Efficient Condensation between
Glyoxal Hydrates and Sulfonium Salts Leading to Highly
Functionalized 1,4-Diketones
作者:Chunbao Li、Qiyun Shao
DOI:10.1055/s-2008-1078267
日期:——
α-Alkylthio-substituted α,β-unsaturated 1,4-dicarbonyl compounds with three different functionalities are easily available through condensation of sulfonium salts and various aromatic or aliphatic glyoxal hydrates catalyzed by Na2SeO3 or a combination of selenium dioxide and Na2CO3.
Tunable Condensations between
Ninhydrin and Sulfonium Salts Catalyzed by SeO<sub>2</sub> and
Cs<sub>2</sub>CO<sub>3</sub> Leading to Highly Functionalized Vinyl
Alcohols or Vinyl Sulfides
作者:Chunbao Li、Qiyun Shao、Wenbo Shi
DOI:10.1055/s-0028-1087944
日期:——
Condensation reactions between ninhydrin and sulfonium salts catalyzed by SeO 2 and Cs 2 CO 3 afforded highly functionalized vinyl alcohols and vinyl sulfides. In the reaction of ninhydrin with dipropyl phenacylsulfonium bromide catalyzed by SeO 2 at room temperature in MeCN, highly functionalized vinyl alcohols were formed in good yields and high selectivities. When dimethyl phenacylsulfonium iodide
SeO 2 和Cs 2 CO 3 催化茚三酮和锍盐之间的缩合反应得到高度官能化的乙烯醇和乙烯基硫化物。在室温下,在 MeCN 中,在 SeO 2 催化下茚三酮与二丙基苯甲酰基溴化锍的反应中,以良好的收率和高选择性形成了高度官能化的乙烯醇。当使用二甲基苯甲酰碘化锍代替二丙基苯甲酰溴化锍时,乙烯基硫化物的收率中等至良好。