A solvent-free approach for the regioselective synthesis of β-amino alcohols inshorter reaction times and higher yields, compared to conventional heating is described. Itinvolves microwave (MW) exposure of undiluted reactants in the presence of sulphatedzirconia (SZ) or sulphated zirconia over MCM-41 (SZM) as catalyst. Both acid materialscan be easily recovered and reused.
Sulfated zirconia and SZ/MCM-41 were used as catalysts for the synthesis of β-aminoalcohols via epoxide aminolysis. Sulfated zirconia was prepared by sol-gel andSZ/MCM-41 was obtained by impregnation. Solid catalysts were characterized by XRD,SEM-EDS, UV-Vis, FT-IR pyridine desorption and Nitrogen physisorption. Both acidmaterials were useful as catalysts, even when they were recycled several times. The β-aminoalcohols were characterized by FT-IR, 1H- and 13C-NMR and GC-MS.
Maiti, Gourhari; Kundu, Pradip; Mallik, Asok K., Journal of the Indian Chemical Society, 2008, vol. 85, # 4, p. 412 - 416
作者:Maiti, Gourhari、Kundu, Pradip、Mallik, Asok K.
DOI:——
日期:——
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.