Abstract
Cu-Fe spinels promoted the Ferrier rearrangement of 2-nitroglycals with several O-nucleophiles. 2,3-Unsaturated carbohydrate derivatives were prepared by the reaction of 3,4,6-tri-Oacetyl- 2-nitroglucal and alcohols in the presence of 5 % of CuFe2O4. After separation of the catalyst with an external magnet, the reaction products were obtained in good yields and high stereo and regioselectivity. Also, S- and heterocyclic C-3 substituted 2-nitro-endo-glycals could be prepared by this method.
Keywords: 2-Nitroglycals, Cu-Fe spinels, Ferrier rearrangement, magnetically recoverable catalyst, unsaturated heterocycle, carbohydrate.
Graphical Abstract
(b) Cai, S-T.; Xiang, S-H.; Zeng, J.; Gorityala, B.K.; Liu, X-W. Chem. Commun., 2011, 47, 8676-8678.
(b) Winterfeld, G.A.; Khodair, A.I.; Schmidt, R.R. Eur. J. Org. Chem., 2003, 6, 1009-1021.
(b) Mori, T.; Ichiyanagi, T.; Kondo, H.; Tokunaga, K.; Oda, T.; Munakata, K. J. Antibiot., 1971, 24, 339-346.
(b) Jiao, H.; Jiao, G.; Wang, J.S. ynth. React. Inorg. M, 2013, 43, 131-134.
(b) Lafuente, L.; Díaz, G.; Bravo, R.; Ponzinibbio, A. Lett. Org. Chem., 2016, 13, 195-200.
(c) Díaz, G.; Ponzinibbio, A.; Bravo, R.D. Carbohydr. Res., 2014, 393, 23-25.
(d) Díaz, G.; Ponzinibbio, A.; Bravo, R.D. Top. Catal., 2012, 55, 644-648.
(e) Tasca, J.E.; Ponzinibbio, A.; Diaz, G.; Bravo, R.D.; Lavat, A.; González, M.G. Top. Catal., 2010, 53, 1087-1090.
(f) Ponzinibbio, A.; Colinas, P.A.; Lieberknecht, A.; Bravo, R.D. Lett. Org. Chem., 2006, 3, 459-462.
(g) Colinas, P.A.; Ponzinibbio, A.; Lieberknecht, A.; Bravo, R.D. Tetrahedron Lett., 2003, 44, 7985-7988.