{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,2]],"date-time":"2026-08-02T23:06:22Z","timestamp":1785711982003,"version":"3.56.0"},"reference-count":38,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2009,7,15]],"date-time":"2009-07-15T00:00:00Z","timestamp":1247616000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Calix[4]pyrrole (1), calix[2]m-benzo[4]pyrrole (2), 10\u03b1,20\u03b2- and 10\u03b1,20\u03b1- bis(4-nitrophenyl)-calix[4]pyrroles 3 and 4, respectively, were found to exhibit various organocatalytic activities in the diastereoselective vinylogous addition reaction of 2-trimethylsilyloxyfuran (TMSOF, 7) to aldehydes. The \u03b3-hydroxybutenolide products are obtained in fairly good yields and with moderate diastereoselectivity. The structures of the catalysts, as well as the reaction conditions, strongly influence the efficiency of the reaction.<\/jats:p>","DOI":"10.3390\/molecules14072594","type":"journal-article","created":{"date-parts":[[2009,7,16]],"date-time":"2009-07-16T02:57:24Z","timestamp":1247713044000},"page":"2594-2601","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Calixpyrrole Derivatives: \u201cMulti Hydrogen Bond\u201d Catalysts for \u03b3-Butenolide Synthesis"],"prefix":"10.3390","volume":"14","author":[{"given":"Grazia","family":"Cafeo","sequence":"first","affiliation":[{"name":"Department of Organic and Biological Chemistry, University of Messina, Salita Sperone 31, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7451-5523","authenticated-orcid":false,"given":"Margherita","family":"De Rosa","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franz  H.","family":"Kohnke","sequence":"additional","affiliation":[{"name":"Department of Organic and Biological Chemistry, University of Messina, Salita Sperone 31, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Annunziata","family":"Soriente","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carmen","family":"Talotta","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luca","family":"Valenti","sequence":"additional","affiliation":[{"name":"Department of Organic and Biological Chemistry, University of Messina, Salita Sperone 31, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2009,7,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lee, C.H., Miyaji, H., Yoon, D.W., and Sessler, J.L. 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