PEG-600 mediated one-pot reaction of 3-acetyl-2H-chromen-2-one with heterylthiols and phenylthioureas using tetrabutylammonium tribromide as an efficient green reagent
作者:Devulapally Srikrishna、Pramod Kumar Dubey
DOI:10.1039/c7nj00504k
日期:——
effective solvent for this reaction. Thus, a one-pot reaction of equimolar amounts of 3-acetyl-2H-chromen-2-one, TBATB and heterylthiols or phenylthioureas, resulted in the formation of heterylthioacetylcoumarins or coumarinylthiazoles, respectively. The effect of the solvent on these reactions was studied. The merits of this preparation are the mild reaction conditions, easy workup, good yields and use
已经描述了一种简单的方法,该方法使用三溴化四丁基铵(TBATB)作为有效试剂,在绿色条件下使3-乙酰基2 H-铬-2-分子与不同的杂硫醇和苯硫脲进行一锅反应。使3-乙酰基-2 H-铬-2--2-酮与TBATB在乙酸中反应,得到3-(2-溴乙酰基)-2 H-铬2--2-酮。发现聚(乙二醇)600(PEG-600)是该反应的有效溶剂。因此,等摩尔量的3-乙酰基-2 H的一锅反应-chromen-2-one,TBATB和杂硫醇或苯硫脲分别导致杂硫基乙酰香豆素或香豆基噻唑的形成。研究了溶剂对这些反应的影响。该制备方法的优点是反应条件温和,后处理容易,产率高以及将PEG-600用作绿色反应介质。