3606-32-4Relevant articles and documents
Enantioselective Synthesis of Isoflavanones and Pterocarpans through a RuII-Catalyzed ATH-DKR of Isoflavones
Caleffi, Guilherme S.,Costa, Paulo R. R.,Costa-Júnior, Paulo C. T.,Gaspar, Francisco V.
, p. 5097 - 5108 (2021/10/20)
Noyori-Ikariya RuII complexes promoted the one-pot C=C/C=O bonds reduction of isoflavones using sodium formate as the hydrogen source through Asymmetric Transfer Hydrogenation-Dynamic Kinetic Resolution (ATH-DKR). Due to the neutral conditions employed, isoflavones with different substituents at the 2’-position of B-ring (H, OH, OMe and Br) were successfully reduced. Ten cis-3-phenylchroman-4-ols were selectively obtained (>20 : 1 dr) in good yields (up to 86 %) and excellent enantioselectivities (up to >99 : 1 er). The synthetic applications of these chiral compounds were also demonstrated. Enantioenriched isoflavanones were obtained under mild metal-free oxidation of the cis-3-phenylchroman-4-ols while pterocarpans were synthesized by two strategies: an acid-catalyzed cyclization and a novel approach based on a Pd-catalyzed C?O intramolecular cross-coupling reaction.
TWO FLAVONOID GLYCOSIDES FROM THE BARK OF PROSOPIS JULIFLORA
Shukla, Ranjana Vajpeyi Nee',Misra, Krishna
, p. 339 - 340 (2007/10/02)
Key Word Index - Prosopis juliflora; Leguminoseae; flavonol glycoside; kaempferol 4'-methyl ether 3-O-β-D-galactopyranoside; isoflavone glycoside; retusin 7-O-neohesperidoside. Two new glycosides, kaempferol 4'-methyl ether 3-O-β-D-galactopyranoside and retusin 7-O-neohesperidoside, have been characterized from the bark of Prosopis juliflora.
