期刊
ORGANIC CHEMISTRY FRONTIERS
卷 3, 期 7, 页码 846-851出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6qo00165c
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资金
- JSPS KAKENHI [26289299]
- MEXT program Elements Strategy Initiative to Form Core Research Center
- JSPS [25106010]
- Grants-in-Aid for Scientific Research [25106010, 26289299] Funding Source: KAKEN
Direct synthesis of 2,5-disubstituted pyrroles has been achieved via acceptorless dehydrogenative heterocyclization of 1,2-aminoalcohols and secondary alcohols by utilizing a heterogeneous carbon-supported Pt catalyst (Pt/C). The optimized method gave 92% yield of 2-ethyl-5-phenyl-1H-pyrrole as a desired product from 2-amino-1-butanol and 1-phenylethanol in the presence of 0.1 mol% of Pt/C and 1.1 equiv. of KOtBu. It has been revealed that Pt/C demonstrates superior catalytic activity to a number of catalysts tested in this study including other transition metal-loaded carbon and various metal-oxide-supported Pt catalysts. In addition, the turnover number (TON) obtained in the present system was found to be higher than those obtained in previously-reported catalytic systems. It is significant that the Pt/C catalyst could be recycled as a heterogeneous catalyst without significant loss in the activity and showed a wide substrate scope for the 2,5-disubstituted pyrrole forming process.
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