Помогите пожалуйста с двумя статьями:
1.Unexpected pathway of the reaction of N-[(β-halogeno-α-tosyl)alkyl]ureas with β-oxoester enolates. Synthesis of ethyl 5-ureido-4,5-dihydrofuran-3-carboxylates and N-carbamoylpyrrole-3-carboxylates
Nikolay N. Kurochkin, Anastasia A. Fesenko, Dmitry A. Cheshkov, Musa M. Davudi and Anatoly D. Shutalev
Tetrahedron Letters
Volume 52, Issue 1, 5 January 2011, Pages 88-91
Код: Выделить всё
http://dx.doi.org/10.1016/j.tetlet.2010.10.162Anastasia A. Fesenko and Anatoly D. Shutalev
Tetrahedron Letters
Volume 48, Issue 48, 26 November 2007, Pages 8420-8423
Код: Выделить всё
http://dx.doi.org/10.1016/j.tetlet.2007.09.173