Journal
TETRAHEDRON LETTERS
Volume 55, Issue 13, Pages 2150-2153Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2014.02.068
Keywords
Nitrilimine; Intramolecular 3+2 dipolar cycloaddition; Tetrahydrocyclopentylpyrazoles; Tetrahydropyrrolopyrazoles; N-type Calcium Channel
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Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles. (C) 2014 Elsevier Ltd. All rights reserved.
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