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。
Green approach: an efficient synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles in aqueous medium under ultrasonic irradiation
An efficient and rapid procedure for the synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles has been described by the reaction of α-bromoketones with thiourea, phenylthiourea and selenourea at ambient temperature in aqueousmediumunder ultrasonic irradiation. Analytically pure products were formed within 10–60 s in excellent yields. The advantageous features of this non-conventional methodology
Sodium fluoride as an efficient catalyst for the synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles at ambient temperature
作者:Janardhan Banothu、Krishnaiah Vaarla、Rajitha Bavantula、Peter A. Crooks
DOI:10.1016/j.cclet.2013.10.001
日期:2014.1
Abstract Sodium fluoride was found to be a simple, mild and efficient catalyst for the synthesis of 2,4-disubstituted 1,3-thiazoles and selenazoles utilizing phenacyl bromides/3-(2-bromoacetyl)-2 H -chromen-2-one and thiourea/phenylthiourea/selenourea in aqueous methanol at ambient temperature. Analytically pure products are formed within 1–3 min in excellent yields.
Solid-State Synthesis of 1,3-Selenazoles Employing CuPy<sub>2</sub>Cl<sub>2</sub>as a Lewis Acid Catalyst
作者:J. Venu Madhav、B. Suresh Kuarm、B. Rajitha
DOI:10.1080/00397910802162975
日期:2008.9.29
1,3-Selenazoles were Synthesized from 3-bromo acetyl coumarin and selenourea in the presence of CuPy2Cl2 under solvent-free conditions at ambient temperature. The pure products were identified by spectral data.