交联壳聚糖微球负载铜水相催化Ullmann反应（英文）

Cross-Linked Chitosan Bead Supported Copper Complex in Water as a Green and Efficient Catalytic Protocol for Ullmann Reaction

报道了一种交联壳聚糖微球负载铜在水相中催化Ullmann反应的催化体系,对催化剂进行了一系列表征,并考察了催化剂的底物适用性.该催化剂只需要进行简单过滤即可回收,重复使用十次后仍能保持良好的催化活性.

A green,efficient,and recyclable catalytic protocol for Ullmann C-N reaction in water was developed.The catalyst Chi-Gly@CuI was prepared by the cross-linking reaction of chitosan bead with glyoxal and subsequently anchored with copper salt.Chi-Gly@CuI bead of 0.3 mm in mean diameter possesses porous micro-structure demonstrated by scanning electron microscope(SEM).The structure of Chi-Gly@CuI was characterized by Fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TG),X-ray diffraction(XRD),inductively coupled plasma-atomic emission spectrometry(ICP-AES),and X-ray photoelectron spectroscopy(XPS).This catalytic protocol for Ullmann reaction in water exhibited high applicability,from which the corresponding coupling products were afforded in good to excellent yields.Chi-Gly@CuI could be easily separated from products by simple filtration almost without weight loss.Most notably,after 10 times of recycling,its catalytic activity and chemical stability were still maintained.