Palladium-Catalyzed Decarboxylative Arylation of Benzoylacrylic Acids toward the Synthesis of Chalcones
摘要:
It has been found that readily available 3-benzoylacrylic acids undergo palladium-catalyzed decarboxylative arylation with arylboronic acids in the presence of a copper salt oxidant to produce chalcone derivatives. The decarboxylative arylation could also be achieved using aryl halides as the alternative aryl source to expand the applicable scope.
作者:Roland U. Braun、Markus Ansorge、Thomas J. J. Müller
DOI:10.1002/chem.200600530
日期:2006.12.4
coupling of electron-deficient (hetero)aryl halides 1 and (hetero)aryl or alkenyl 1-propargyl alcohols 2 does not terminate at the stage of the expected internal propargyl alcohols, but rather gives rise to the formation of alpha,beta-unsaturated ketones 3 with a variety of acceptor substituents. This new domino reaction, a coupling-isomerization reaction (CIR), can be rationalized as a sequence of
One‐Pot Catalytic Enantioselective Synthesis of 2‐Pyrazolines
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201811471
日期:2019.2.18
A scalable, one‐pot, enantioselective catalytic synthesis of 2‐pyrazolines from beta‐substituted enones and hydrazines is described. Pivoting on a two‐stage catalytic Michael addition/condensation strategy, the use of an aldehyde to generate a suitable hydrazone derivative of the hydrazine was found to be key for curtailing background reactivity and tuning the catalyst‐controlled enantioselectivity
Tetrasubstituted 2,3‐trans‐dihydrofuran and furan are important heterocyclic scaffolds in natural product, bioorganic and medicinal chemistry as well as in material science. The synthesis of both of these heterocycles starting from common and readily available starting materials are challenging. We found that in situ generated deoxybenzoin‐chalcone Michael adducts underwent oxidative annulation upon heating
四取代的2,3-反式二氢呋喃和呋喃是天然产物、生物有机和药物化学以及材料科学中重要的杂环支架。从常见且容易获得的起始材料开始合成这两种杂环具有挑战性。我们发现,原位生成的脱氧安息香-查耳酮迈克尔加合物在 DMSO 中与分子碘一起加热时发生氧化环化,在 80 °C 下选择性地提供 2,3-反式二氢呋喃,在 120 °C 下选择性地提供呋喃。
Formation of 2,4-diaroyl-3,5-diarylthiolanes from chalcones and polysulfide. Scope, conditions, and the thiolane NMR
作者:Robert T. LaLonde、Benjamin A. Horenstein、Kit Schwendler、Richard C. Fritz、Robert A. Florence、Irena Ekiel、Ian C. P. Smith
DOI:10.1021/jo00170a035
日期:1983.11
Mac Lean; Widdows, Journal of the Chemical Society, 1914, vol. 105, p. 2172,2173