Synthesis of functionalized acetophenones by [3+3] cyclizations of 1,3-bis-silyl enol ethers with 2-acetyl-3-silyloxyalk-2-en-1-ones
作者:Rüdiger Dede、Peter Langer
DOI:10.1016/j.tetlet.2004.10.104
日期:2004.12
The TiCl4 mediated cyclization of 1,3-bis-silylenolethers with 2-acetyl-1-silyloxybut-1-en-3-one and 3-acetyl-4-silyloxypent-3-en-2-one, readily prepared from 3-formyl(acetylacetone) and triacetylmethane, afforded a variety of functionalized acetophenones.
Keto−enol tautomerization of 3-formylacetylacetone has been studied by NMR spectroscopy, abinitio, and DFT calculations in the gas phase and continuum solvation. By employing very low temperatures in a freonic solvent, tautomeric and conformational equilibria in the slow exchange regime were analyzed in detail. The β-tricarbonyl compound always adopts a structure with an enolized keto group irrespective
Synthesis of Functionalized Acetophenones by Formal [3+3] Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Alkoxyand 3-Silyloxy-2-acetyl-2-en-1-ones
作者:Rüdiger Dede、Abdolmajid Riahi、Mohanad Shkoor、Mirza A. Yawer、Ibrar Hussain、Nazken Kelzhanova、Zharylkasyn A. Abilov、Abiodun Falodun、Helmar Görls、Peter Langer
DOI:10.5560/znb.2013-3123
日期:2013.9.1
cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 2-acetyl-1-silyloxybut-1- en-3-one and 3-acetyl-4-silyloxypent-3-en-2-one, readily available from 3-(formyl)acetylacetone and 3-(acetyl)acetylacetone (triacetylmethane), afforded a variety of functionalized acetophenones Graphical Abstract Synthesis of Functionalized Acetophenones by Formal [3+3] Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with