prepared and used as a novel magnetically retrievable nanocatalyst for efficient ring opening of epoxides with aromatic amines. A variety of aryl and alkyl epoxides were examined under the mild reaction condition and the corresponding β-amino alcohols were obtained in good to excellent yields under solvent-free condition. Using the Fe3O4 as a low-priced magnetic support to immobilize an active material
制备了磁性石墨碳氮化碳(gC 3 N 4)纳米复合材料,并将其用作新型的可磁性回收的纳米催化剂,用于与芳族胺有效地使环氧化物开环。在温和的反应条件下检查了各种芳基和烷基环氧化物,并在无溶剂条件下以良好至极好的收率获得了相应的β-氨基醇。使用Fe 3 O 4作为廉价的磁性载体来固定活性材料gC 3 N 4可以提供比使用传统催化剂更好的结果,即效率,产率,后处理容易,反应时间短,再生,并且易于应用。
Solvent-free aminolysis of aliphatic and aryloxy epoxides with sulfated zirconia as solid acid catalyst
作者:Arpan K. Shah、Manish Kumar、Sayed H.R. Abdi、Rukhsana I. Kureshy、Noor-ul H. Khan、Hari C. Bajaj
DOI:10.1016/j.apcata.2014.08.024
日期:2014.9
Single-step and two-steps synthetic procedure for the synthesis of sulfated zirconia (SZ) was developed, which were calcined at 500, 600 and 700 degrees C and characterized by various physico-chemical methods such as PXRD, FTIR, surface area, microanalysis, NH3-TPD and DRIFT analysis. These SZ materials were then employed as solid acid catalysts for the aminolysis of different aliphatic/aromatic terminal, aryloxy and meso epoxides with aromatic and aliphatic amines under ambient conditions. Amongst the catalyst prepared, SZ-2-600 prepared in two-steps and 600 degrees C calcined was found to be the most efficient catalyst to give beta-amino alcohols in up to 98% yield and >99% regioselectivity. The SZ catalyst was successfully recycled and reused up to six catalytic runs with intact efficiency. (C) 2014 Elsevier B.V. All rights reserved.
Hβ zeolite: An Efficient and Reusable Catalyst for Ring-Opening of Epoxides with Amines Under Microwave Irradiation
作者:Rukhsana I. Kureshy、Santosh Agrawal、Manish Kumar、Noor-ul H. Khan、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1007/s10562-009-0237-z
日期:2010.2
A solvent-free protocol for the synthesis of beta-amino alcohols (Yield, up to 94%) is demonstrated by the ring-opening reactions of meso and terminal epoxides with aromatic amines using H beta zeolite as catalyst under microwave irradiation. The catalytic system is 80 times faster than the reaction conducted at RT with six times catalyst recyclability.