Journal
RSC ADVANCES
Volume 11, Issue 18, Pages 10610-10614Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra01004b
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Funding
- Research Found of East China University of Technology [DHBK2019265, DHBK2019267, DHBK2019264]
- Open Fund of the Jiangxi Province Key Laboratory of Synthetic Chemistry [JXSC202008]
- Natural Science Foundation of Jiangxi Province, China [20202BABL203004]
- National Natural Science Foundation of China [21804019, 22001034]
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A recyclable and efficient heterogeneous green catalyst based on the synthesis of Keggin-type polyoxometalate and vitamin B1 analogue was prepared, which catalyzed Oxa-Pictet-Spengler cyclization of arylethanols and aldehydes to afford various substituted isochromans in moderate conditions with excellent yields. The catalyst could be recycled eight times without significant loss of activity, demonstrating its potential for industrial applications.
A recyclable and efficient heterogeneous, green catalyst based on the synthesis of Keggin-type polyoxometalate (H3PMo12O40) and vitamin B1 analogue 3-ethyl-5-(2-hydroxyethyl)-4-methylthiazol-3-ium (HEMT), i.e., [HEMTH]H-2[PMo12O40] was prepared. Oxa-Pictet-Spengler cyclization of arylethanols and aldehydes were catalyzed to afford various substituted isochromans in moderate conditions with excellent yields using dimethyl carbonate (DMC) as a green solvent. Furthermore, this protocol was applicable in a gram-scale reaction, and the catalyst could be recycled eight times without significant loss of activity.
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