期刊
TETRAHEDRON LETTERS
卷 53, 期 42, 页码 5674-5677出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.08.047
关键词
Bronsted acidic ionic liquids; N-confused calix[4]pyrrole; Catalysis; Pyrrolidonium; Green chemistry
资金
- National Science Council [NSC98-2113-M-007-016-MY3]
- National Tsing Hua University [100N1807E1]
An efficient, green and novel protocol is described for high yield synthesis of N-confused meso-tetra-spirocyclohexyl calix[4]pyrrole. In aqueous solution, the condensation of pyrrole and cyclohexanone in the presence of Bronsted acidic ionic liquid catalysts afforded N-confused calix[4]pyrrole in up to 62.5% yield which represents a threefold yield improvement over existing protocol and makes significant quantity of N-confused calix[4]pyrrole readily available. (c) 2012 Elsevier Ltd. All rights reserved.
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