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1).

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 http://dx.doi.org/doi:10.1016/j.tetlet.2009.02.208   

FeCl3-catalyzed Ritter reaction. Synthesis of amides.
Bruno Anxionnat, Amandine Guérinot, Sébastien Reymond, Janine Cossy.
Tetrahedron Letters, Volume 50, Issue 26, 1 July 2009, Pages 3470-3473, 50th Anniversary Special Issue.

2).

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http://dx.doi.org/doi:10.1016/j.tetlet.2008.09.170

Improved Ritter reaction with CF3-containing oxirane for an access to central units of protease inhibitors.
Mickael Dos Santos, Benoit Crousse, Danièle Bonnet-Delpon.
Tetrahedron Letters, Volume 50, Issue 8, 25 February 2009, Pages 857-859.

3).

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http://dx.doi.org/doi:10.1016/j.tetlet.2008.07.079     

A Sakurai–Prins–Ritter reaction sequence for the diastereoselective synthesis of 4-amidotetrahydropyrans catalyzed by bismuth triflate. Gowravaram Sabitha, M. Bhikshapathi, Sambit Nayak, J.S. Yadav, R. Ravi, A.C. Kunwar.
Tetrahedron Letters, Volume 49, Issue 40, 29 September 2008, Pages 5727-5731.

4).

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 http://dx.doi.org/doi:10.1016/j.tetlet.2008.02.009

Nafion®-catalyzed microwave-assisted Ritter reaction: an atom-economic solvent-free synthesis of amides.
Vivek Polshettiwar, Rajender S. Varma.
Tetrahedron Letters, Volume 49, Issue 16, 14 April 2008, Pages 2661-2664.

5).

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http://dx.doi.org/doi:10.1016/j.carres.2006.11.006   

Ritter-based glycoconjugation of amino acids and peptides—access to novel glycoconjugates displaying a β-amide linkage between amino acid and sugar moiety. Marlin Penner, Frank Schweizer.
Carbohydrate Research, Volume 342, Issue 1, 15 January 2007, Pages 7-15.

6).

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http://dx.doi.org/doi:10.1016/j.tetlet.2006.10.023

Synthesis of amides using the Ritter reaction with bismuth triflate catalysis.
Emmanuel Callens, Andrew J. Burton, Anthony G.M. Barrett.
Tetrahedron Letters, Volume 47, Issue 49, 4 December 2006, Pages 8699-8701.

7).

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http://dx.doi.org/doi:10.1016/j.tetlet.2006.07.079

Facile preparation of difluoromethyl- and monofluoromethyl-containing amides via Ritter reaction.
Jun Liu, Chuanfa Ni, Ya Li, Laijun Zhang, Guanyu Wang, Jinbo Hu.
Tetrahedron Letters, Volume 47, Issue 38, 18 September 2006, Pages 6753-6756.

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http://dx.doi.org/doi:10.1016/j.tetlet.2005.10.149 

1,3-Dioxonium cation facilitated Ritter-type reaction: facile synthesis of protected aminopolyols.
Xuezheng Song, Rawle I. Hollingsworth.
Tetrahedron Letters, Volume 47, Issue 2, 9 January 2006, Pages 229-232.

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