Metal-free access of bulky N,N′-diarylcarbodiimides and their reduction: bulky N,N′-diarylformamidines
作者:Thota Peddarao、Ashim Baishya、Milan Kr. Barman、Ajay Kumar、Sharanappa Nembenna
DOI:10.1039/c6nj00907g
日期:——
N′-diarylcarbodiimide has been reported using toxic metal oxide (HgO) and magnesium sulphate (MgSO4) under harsh reaction conditions. Furthermore, easy access to 1,3-disubstituted symmetric and unsymmetrical N,N′-diaryl formamidines involving the reaction of symmetrical and unsymmetrical N,N′-diaryl carbodiimides with sodium borohydride is described. The widely used method for the preparation of bulky N,N′-diaryl
已经建立了在温和的反应条件下以中等至优异的收率通过将相应的N,N'-二芳基硫脲与4-二甲基氨基吡啶(DMAP)和碘脱氢脱硫而合成的对称和不对称的大块N,N'-二芳基碳二亚胺。在文献中,已经报道了在苛刻的反应条件下使用有毒金属氧化物(HgO)和硫酸镁(MgSO 4)将大体积的N,N'-二芳基硫脲脱硫为N,N'-二芳基碳二亚胺的经典方法。此外,易于获得1,3-二取代的对称和不对称Ñ,Ñ '涉及对称和不对称反应-diaryl甲脒Ñ,Ñ '用硼氢化钠-diaryl碳二亚胺进行说明。制备大体积的N,N′-二芳基甲am的广泛使用的方法是在酸的存在下,在高温反应条件下,用原甲酸三乙酯处理伯胺。