A Modified and Green Procedure for the Synthesis of β-Amido Ketones
Scheme 2
Conclusion
15 Pandey, G.; Singh, R. P.; Garg, A.; Singh, V. K. Tetrahedron
Lett. 2005, 46, 2137.
In conclusion, we have developed a mild, green and
improved method for the synthesis of β-amido ketones
through one-pot MCR of an enolizable ketone, aryl al-
dehyde, acetonitrile or benzonitrile in the presence of
TMSCl using 3-methyl-1-(4-sulfonic acid)butylimida-
zolium hydrogen sulfate [(CH2)4SO3HMIM][HSO4], a
Brønsted-acidic IL, as catalyst. The catalyst can be re-
used after a simple work-up, but the catalytic activity
lowered probably resulting from the loss of IL during
recovery. Good to excellent yields, relatively short reac-
tion time, simplicity of operation and easy work-up are
some advantages of this protocol.
16 Khodaei, M. M.; Khosropour, A. R.; Fattahpour, P. Tetrahe-
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17 Sanjeeva, R. C.; Purnachandra, R. G. Chin. J. Chem. 2008, 26,
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18 Ghosh, R.; Maiti, S.; Chakraborty, A.; Chakraborty, S.;
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22 Nagarapu, L.; Bantu, R.; Puttireddy, R. Appl. Catal. A 2007,
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