Samarium Diiodide in the Synthesis of Medium-Sized Rings - Carbocycles and Heterocycles by Intramolecular Addition of Samarium Ketyls to Alkynes
作者:Hans-Ulrich Reissig、Alexandra Hölemann
DOI:10.1055/s-2004-835657
日期:——
A series of alkynyl-substituted ketones and aldehydes was subjected to samariumdiiodide in the presence of HMPA to study the scope and limitations of their ketyl-alkyne coupling. Seven- and eight-membered heterocycles such as 4, 6, 8, 25, 27, 29, 33, and 35 could be isolated in moderate to good yields. Other cyclization products were isolated in low yields only. The efficacy of the reductive cyclization
Schweitzer, Stefan; Voss, Gundula; Gerlach, Hans, Liebigs Annalen der Chemie, 1994, # 2, p. 189 - 192
作者:Schweitzer, Stefan、Voss, Gundula、Gerlach, Hans
DOI:——
日期:——
Total synthesis of a dienynone from Echinacea pallida
作者:Stefania Morandi、Federica Pellati、Stefania Benvenuti、Fabio Prati
DOI:10.1016/j.tet.2008.04.094
日期:2008.6
The first total synthesis of (8Z,13Z)-pentadeca-8,13-dien-11-yn-2-one is described. This dienynone was recently isolated from the n-hexane extract of Echinacea pallida roots and displayed a selective cytotoxic activity toward cancer cells, thus featuring as a potential anticancer lead. The product was obtained in 11 steps in 25% overall yield. (C) 2008 Elsevier Ltd. All rights reserved.
SATO FUMIE; KODAMA HIROYUKI; SATO MASAO, CHEM. LETT., 1978, NO 7, 789-790