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Помогите, пожалуйста, достать 4 свежих статьи.

1. Calcium fluoride: an efficient and reusable catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and their corresponding 2(1H)thione: an improved high yielding protocol for the Biginelli reaction
S. Chitraa and K. Pandiarajan
Tetrahedron Letters
Volume 50, Issue 19, 13 May 2009, Pages 2222-2224

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http://dx.doi.org/10.1016/j.tetlet.2009.02.162

2. Organocatalyzed enantioselective synthesis of 6-amino-5-cyanodihydropyrano[2,3-c]pyrazoles
Sanjib Gogoia and Cong-Gui Zhao
Tetrahedron Letters
Volume 50, Issue 19, 13 May 2009, Pages 2252-2255

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http://dx.doi.org/10.1016/j.tetlet.2009.02.210

3. A regioselective three-component reaction for synthesis of novel 1′H-spiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione derivatives
Ali A. Mohammadi, a, , M. Dabiri, a, and H. Qaraata
Tetrahedron
Volume 65, Issue 18, 2 May 2009, Pages 3804-380

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http://dx.doi.org/10.1016/j.tet.2009.02.037

4. Novel Regio- and Stereoselective Synthesis of Functionalized 3-Spiropyrrolidines and 3-Spiropyrrolizidines Using the Baylis-Hillman Adducts Derived from Nitroolefins
Manickam Bakthadoss*, Nagappan Sivakumar
Synlett 2009: 1014-1018

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http://dx.doi.org/10.1055/s-0028-1088206

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