中文摘要：

设计、合成了一种新型的三氮唑桥连吡啶盐聚L-亮氨酸Julia-Colonna反应催化剂QC-1，在查尔酮类化合物的不对称环氧化反应中可以同时兼作手性催化剂和相转移催化剂，显示了理想的催化活性、立体选择性和底物普适性。反应对多种查尔酮类底物均可获得高的对映选择性，最高达98％e．e．，尤其是对邻位取代苯基查尔酮类化合物的不对称环氧化亦可实现85％-90％e．e．；反应速度快、催化剂用量可显著减少，当催化剂用量减至1m01％时，对查尔酮的环氧化仍可以85％的收率和90％e．e．获得目标产物。同时，通过此种结构修饰，改善了催化剂的性状，粉末状的催化剂易回收，且在循环使用中保持催化活性，解决了催化剂的回收、再利用问题，具有潜在的工业化应用前景。

英文摘要：

A novel Julia-Colonna catalyst pyridinium-modified poly（L-leucine） bridged by 1,2,3-triazol （QC-1） was syn- thesized which acted as chiral catalyst and phase transfer cat- alyst for the asymmetric epoxidation of chalcones. The catalyst exhibited high activity, enantioselectivity （up to 98% e.e. ） and substrate universality. Especially,the substrates with or- tho-substitution on phenyl of chalcones can also give 85% ~ 90% e. e. values. The loading （ weight percentage） of this catalyst was greatly deceased, compared to those of classical Juliti-Colonna catalysts,and the epoxidation of chalcone affor- ded the corresponding epoxide with a yield of 85% and enan- tioselectivity of 90% e. e. when the catalyst amount was de- creased to 1% tool. Furthermore,the modified catalyst can be recycled easily for the insoluble, powdery property, and the catalytic efficiency was retained after seven cycles which showes the potential industrial application prospect.