Anti-oxidant activities of curcumin and related enones
作者:Waylon M. Weber、Lucy A. Hunsaker、Steve F. Abcouwer、Lorraine M. Deck、David L. Vander Jagt
DOI:10.1016/j.bmc.2005.03.035
日期:2005.6
anti-oxidant properties. There are conflicting reports concerning the structural/electronic basis of the anti-oxidant activity of curcumin. Curcumin is a symmetrical diphenolic dienone. A series of enone analogues of curcumin were synthesized that included: (1) curcumin analogues that retained the 7-carbon spacer between the aryl rings; (2) curcumin analogues with a 5-carbon spacer; and (3) curcumin
Utilizing two robust C–C bond-forming reactions, the Baylis–Hillman reaction and the Diels–Alder reaction, we report a highly enantio-, regio-, and diastereoselectivesynthesis of hexahydro-2H-chromenes via two sequential [4 + 2] cycloadditions. These tandem and formal cycloadditions have also been performed as a “one-pot” sequence to access the corresponding heterocycles constituting up to five contiguous
Regioselective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones: Synthesis of N-enone-functionalized 3-(arylimino)indolin-2-ones
作者:Xiao Chen、Zheng Li
DOI:10.1177/1747519820920179
日期:2020.11
Selective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones in the presence of cesium carbonate are described. N-Enone-functionalized 3-(arylimino)indolin-2-ones were efficiently synthesized in satisfactory yield. The salient features of this protocol are high regioselectivity, high yield, and mild conditions.
for multisubstituted pyridines from β-aryl-substituted α,β-unsaturated oxime ethers and alkenes via Pd-catalyzed C–H activation has been developed. Systematic optimization of catalyst ligands revealed that sterically hindered pyridines increased the reactivity. Mechanistic studies suggested that the products are formed by Pd-catalyzed β-alkenylation of α,β-unsaturated oxime followed by aza-6π-electrocyclization
Eco-Friendly Mono-1,4-Hydrocyanation of Diarenyl Ketones Using Potassium Hexacyanoferrate(II) as a Cyanide Source
作者:Xiao-Ning Hu、Chen-Hui Liu、Zheng Li
DOI:10.3184/174751915x14197812950625
日期:2015.1
A selective mono-1,4-hydrocyanation of 10 diarenyl ketones usingpotassiumhexacyanoferrate(II) as an eco-friendlycyanidesource, potassium hydroxide as a catalyst, and benzoyl chloride as a promoter has been achieved. This protocol has the advantages of a non-toxic cyanidesource, a heavy metal-free catalyst, selectivity, very good yields and a simple work-up procedure.