Catalytic properties and acidity of 1,2-benzenedisulfonimide and some of its derivatives. An experimental and computational study
作者:Margherita Barbero、Silvia Berto、Silvano Cadamuro、Pier Giuseppe Daniele、Stefano Dughera、Giovanni Ghigo
DOI:10.1016/j.tet.2013.02.053
日期:2013.4
the results of a search for derivatives of 1 that are more acidic and effective. Instead of blindly synthesizing a series of analogues, we have carried out a screening process in which the pKa of 1 and a set of its derivatives were calculated. The calculated pKa values were confirmed experimentally by carrying out determination through potentiometric titrations of some of the compounds: 1, 4-methyl
先前已发现1,2-苯二甲磺酰亚胺(1)是优异且重要的是安全的布朗斯台德酸催化剂。在这项工作中,我们提出了寻找酸性更高且更有效的1的导数的结果。我们不是盲目合成一系列类似物,而是进行了筛选过程,在该过程中计算了p K a为1及其一组衍生物。计算的P ķ一个值通过通过的一些化合物的电势滴定进行测定实验证实:1,4-甲基和4-硝基衍生物1。计算表明,二硝基和4-硝基衍生物是合成的最佳候选物。后者以高收率获得,并作为催化剂进行了测试。在所有情况下,反应均在较低的温度下更快地进行,结果是极好的,在许多情况下,甚至有可能减少催化剂的用量。