Journal
TETRAHEDRON LETTERS
Volume 110, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2022.154186
Keywords
Nitrilimine 1,3-dipolar cycloaddition; Aldohydrazone; Tetraazaspiro[4.5]dec-1-ene; Spiro[indene-2,40-pyrazole]
Categories
Funding
- National Natural Science Foundation of China [21871227, 22101247]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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In the presence of TEMPO as an oxidizer, a new synthetic method for functionalized spiro compounds was developed through the reaction of aldohydrazones with 2-arylidene-1,3-indnaediones or 5-arylidene-1,3-dimethylbarbituric acids.
In the presence of 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as an oxidizer, the domino [3 + 2] cycloaddition reaction of aldohydrazones with 2-arylidene-1,3-indnaediones or 5-arylidene-1,3-dimethylbarbituric acids in acetonitrile at 80 degrees C afforded functionalized spiro[indene-2,4'-pyrazoles]1,3-diones or 2,3,7,9-tetraazaspiro[4.5]dec-1-ene-6,8,10-triones in satisfactory yields. This reaction was believed to proceed with in situ generation of reactive 1,3-dipolar nitrilimine and its sequential 1,3-dipolar cycloaddition reaction with cyclic dipolarophiles. Thus, a new convenient synthetic method for the active dipolar nitrilimine was successfully developed. (C) 2022 Elsevier Ltd. All rights reserved.
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