Journal
TETRAHEDRON
Volume 64, Issue 10, Pages 2425-2432Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.12.053
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A novel approach to one-pot synthesis of dihydrofuro[3',4':5,6]pyrido[2,3-c]pyrazole and indeno[2',1':5,6]pyrido[2,3-c]pyrazole derivatives have been investigated using organocatalysts that are recyclable. This new protocol has the advantages of environmental friendliness, higher yield, low cost, as well as convenient operation. The catalytic efficiency of various small organocatalysts such as L-proline, trans-4-hydroxy-L-proline, L-thiaproline, cinchonidine, (+)-cinchonine, and DL-2-phenylglycine has also been studied. (C) 2008 Elsevier Ltd. All rights reserved.
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