Selective Monoacylation of Symmetrical Diamines via Prior Complexation with Boron
作者:Zhongxing Zhang、Zhiwei Yin、Nicholas A. Meanwell、John F. Kadow、Tao Wang
DOI:10.1021/ol0300773
日期:2003.9.1
[reaction: see text] Pretreatment of a symmetrical primary or secondary diamine with 9-BBN prior to the addition of an acyl chloride significantly suppressed undesired diacylation, and the product of monoacylation predominated. The reactive preference is interpreted as the result of a selective deactivation of one nitrogen atom of the diamine by 9-BBN.
One-Pot Anodic Conversion of Symmetrical Bisamides of Ethylene Diamine to Unsymmetrical <i>gem</i>-Bisamides of Methylene Diamine
作者:Tatiana Golub、Gui-yuan Dou、Cheng-chu Zeng、James Y. Becker
DOI:10.1021/acs.orglett.9b02917
日期:2019.10.4
Symmetrical bisamides of ethylene diamine of type ArCONHCH2CH2NHCOAr undergo anodic C-C bond cleavage in acetonitrile-LiClO4 under controlled-potential electrolysis. The electrogenerated carbocation intermediates react with the solvent acetonitrile to afford unsymmetrical gem-bisamides of type ArCONHCH2NHCOMe in a one-pot reaction. The yields of the latter products are moderate (up to 60%). Other minor
Efficient and continuous monoacylation with superior selectivity of symmetrical diamines in microreactors
作者:Ram Awatar Maurya、Phan Huy Hoang、Dong-Pyo Kim
DOI:10.1039/c1lc20765b
日期:——
Efficient and continuous monoacylation of symmetricaldiamines performed in microreactors yielded superior selectivity to that predicted by statistical considerations. It is highly valuable that the kinetically controlled product in high yields was achieved without any special catalyst at ambient temperature.
Taming diamines and acyl chlorides by carbon dioxide in selective mono-acylation reactions
作者:Jerik Mathew Valera Lauridsen、Margarita Poderyte、Ji-Woong Lee
DOI:10.1039/d2gc04478a
日期:——
acylation of diamines with corresponding acyl donors, using a protecting group, or with excess amounts of diamines to prevent unwanted diacylation reactions. Here we report a practical and atom-economical method to access monoamide and unsymmetric diamides with diamines and stoichiometric amounts of acylchlorides – the most accessible and highly reactive acyl donor. The reactivity of diamines can be
二酰胺普遍存在于有机分子的化学结构中,具有多种应用。这些二酰胺中的大多数是通过二胺与相应的酰基供体、使用保护基团或与过量的二胺进行酰化以防止不需要的二酰化反应而获得的。在这里,我们报告了一种实用且原子经济的方法,以使用二胺和化学计量的酰氯(最容易获得且反应性高的酰基供体)获得单酰胺和不对称二酰胺。二胺的反应性可以通过CO 2来控制作为单酰化反应的绿色、临时、无痕保护基团,实现高原子效率和低环境因素。我们证明了该方法具有广泛的底物范围和大规模反应的实用性,并进行了对照实验以阐明使用 CO 2获得的高选择性的来源。我们发现稀薄空气中的环境 CO 2会影响二胺单酰化的选择性,这意味着大气 CO 2在有机合成中具有普遍影响。
Chattaway, Journal of the Chemical Society, 1905, vol. 87, p. 384