A variety of 4,5-dihydrofuro[2,3-b]azocin-6-one derivatives were expediently assembled through Au(I)-catalyzed cyclization and 2-(tert-butyl)-1,1,3,3-tetramethylguanidine (BTMG)-mediated [4+4] annulation reactions of enyne-amides and ynones. The reactions exhibit high efficiency with excellent regio- and diastereoselectivity. A broad spectrum of substrates was utilized. The products with an eight-membered
通过 Au(I) 催化环化和 2-(叔丁基)-1,1,3,3-四甲基胍,方便地组装了多种 4,5-二氢呋喃[2,3- b ]azocin-6-one 衍生物(BTMG)-介导的烯炔酰胺和炔酮的[4+4]环化反应。该反应表现出高效率以及出色的区域和非对映选择性。使用了广泛的底物。具有八元环的产品可能在生物化学和医学科学中有用。此外,产品可以很容易地转化为各种衍生物。
Stereoselective Synthesis of Polysubstituted Conjugated Dienes Enabled by Photo‐Driven Sequential Sigmatropic Rearrangement
作者:Xin Ji、Chaoren Shen、Yuhao Ni、Zhi‐Yao Si、Yuzhu Wang、Xinrong Zhi、Yuting Zhao、Huiling Peng、Lu Liu
DOI:10.1002/anie.202400805
日期:2024.6.10
An unprecedented photo-driven quadruple sequential sigmatropic rearrangements of α-aryl α-diazo alkynylketones with aminals via 1,6-dipolar ion intermediate is disclosed. This protocol provides a facile access to synthetically useful multi-substituted conjugated dienes in highly stereoselective manner via visible light catalysis in mild conditions.
Palladium-catalyzed acylation and/or homo-coupling of aryl- and alkyl-acetylenes
作者:Serena Perrone、Fabio Bona、Luigino Troisi
DOI:10.1016/j.tet.2011.07.032
日期:2011.9
Allyl or benzyl halides, through a Pd(0)-catalyzed reaction and under CO pressure, generate acyl-palladium/halides that, in the presence of a base and an aryl- and alkyl-acetylene, undergo nucleophilic acyl substitution giving conjugated acetylenic ketones. Diynes, resulting from allcyne/alkyne homo-coupling, were instead the main products in reactions performed without allyl or benzyl halides. Moreover, dimerization, trimerization, and cyclotrimerization reactions of acetylenes were observed in reaction carried out even without base. (C) 2011 Elsevier Ltd. All rights reserved.