O afforded primary selenocarboxylic amides. The cyclization of these compounds with α-halo ketones afforded a variety of functionalized 1,3-selenazoles. Theuse of P 2 Se 5 also allowed the convenient synthesis of selenocarboxylic diamides which were transformed into bis(selenazol-2-yl)alkanes ('bis-selenazoles'). A practical method for the synthesis of selenourea was developed. This useful small building
在 EtOH-H 2 O 存在下腈与 P 2 Se 5 的反应得到伯硒代羧酸酰胺。这些化合物与 α-卤代酮的环化得到了多种功能化的 1,3-硒唑。使用 P 2 Se 5 还可以方便地合成硒代羧酸二酰胺,该二酰胺被转化为双(硒唑-2-基)烷烃(“双硒唑”)。开发了一种合成硒脲的实用方法。这种有用的小结构单元成功地应用于伯2-氨基-1,3-硒唑的合成。
Hypervalent Iodine in Synthesis 53: Synthesis of 2,4-Disubstituted and 2,4,5-Trisubstituted 1,3-Selenazoles
作者:Peng-Fei Zhang、Zhen-Chu Chen
DOI:10.1055/s-2000-6407
日期:——
α-Tosyloxylation of ketones with [hydroxy(tosyloxy)iodo]benzene, followed by treatment with primary selenoamides provides a convenient method of synthesis of selenazoles without the use of lachrymatory and toxic α-haloketones. The synthetic method is simple, mild and the yields are higher.
Hypervalent iodine in synthesis 50: A novel method of synthesis of selenazoles by cyclocondensation of selenoamides and alkynyl(phenyl)iodonium salts
作者:Peng-Fei Zhang、Zhen-Chu Chen
DOI:10.1002/jhet.5570380233
日期:2001.3
A novel method for the synthesis of selenazoles by cyclocondensation of primary selenoamides and alkynyl(phenyl)iodomium salts and the reaction mechanism are reported. The synthetic method is simple, mild and the yields are high.