A Highly Efficient and Recyclable Solid Acid Catalyst for Synthesis of Spiro-oxindole Dihydroquinazolinones Under Ultrasound Irradiation
Xiufang Yang , Xiaogang Wang , Tingting Wang , Weitao Wang , Jin Zhang , Yangmin Ma
Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (1) : 33 -40.
A Highly Efficient and Recyclable Solid Acid Catalyst for Synthesis of Spiro-oxindole Dihydroquinazolinones Under Ultrasound Irradiation
A simple, efficient and green procedure for the synthesis of spiro-oxindole dihyfroquinazolinones was developed by multi-component condensation of isatoic anhydride, aniline and isatin in the presence of a novel solid acid catalyst under ultrasound irradiation. The present environmentally benign protocol offers several advantages, such as shorter reaction time, a wide range of functional group tolerance, the use of an inexpensive heterogeneous catalyst, and a high yield of products via a simple experimental and work-up procedure. The mesoporous solid acid catalyst was directly prepared from phytic acid by microwave-sulfonation method without template. The phytic acid based solid acid was fully characterized by means of Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), and transmission electron microscopy(TEM). The catalyst can be recovered and reused for at least five runs without significant impact on the product yields.
Microwave-sulfonation method / Solid acid catalyst / Spiro-oxindole dihyfroquinazolinone
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| [2] |
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| [3] |
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| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
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