�ber halogen- und stickstoffhaltige Derivate aliphatischer Carbons�uren, 5. Mitt.: �ber die Gewinnung von ?-Oximinocarbons�ureestern und ihre �berf�hrung in ?-Ketos�uren
One-pot oxidative bromination – Esterification of aldehydes to 2-bromoesters using cerium (IV) ammonium nitrate and lithium bromide
作者:Gennady I. Nikishin、Nadezhda I. Kapustina、Lyubov' L. Sokova、Oleg V. Bityukov、Alexander O. Terent'ev
DOI:10.1016/j.tetlet.2016.12.036
日期:2017.1
two-step, one-pot reaction of aldehydes with the CAN/LiBr oxidation system under solvent-free conditions followed by the addition of methanol affords methyl α-bromocarboxylates. The oxidation of aldehydes with methanol using this system gives only methyl esters. A facile method, which does not require special equipment, was developed for the synthesis of 2-bromoesters from aliphaticaldehydes with carbon
Synthesis and antioxidant activity of isoflavones containing hydrophilic and lipophilic substituents
作者:V. G. Pivovarenko、A. V. Tuganova、L. F. Osinskaya、Yu. D. Kholodova
DOI:10.1007/bf02464662
日期:1997.3
lipid substances. The antioxidant activity of isoflavones has been most thoroughly studied in a group of compounds frequently encountered in plants, such as genistein, daidsein, formononetin, and biochanin A [t 4]. At the same time, it is known that flavones (2-arylchromones, 2-aryl-y-pyrones), which are the closest relatives of isoflavones, possess P-vitamin activity and are capable of reducing the
已知异黄酮(3-芳基色酮、3-芳基-]、-吡喃酮)在植物生理学中发挥重要作用 [1]。作为酚类化合物,异黄酮表现出抗氧化特性并且能够抑制脂质物质的氧化。异黄酮的抗氧化活性在植物中经常遇到的一组化合物中得到了最彻底的研究,例如染料木黄酮、大豆异黄酮、芒柄花素和生物素 A [t 4]。同时,已知异黄酮的近亲黄酮(2-芳基色酮、2-芳基-y-吡喃酮)具有维生素P活性,能够降低毛细血管壁的通透性,降低毛细血管壁的通透性。他们的脆弱。这种作用可以通过黄酮类化合物抑制自由基过程的能力来解释,从而保护毛细血管壁免受脂质氧化过程中形成的自由基的有害影响 [5]。黄酮类化合物的抗氧化活性可以通过多种机制表现出来[6]。根据其中之一,通过与脂质自由基和氧的活性形式相互作用,黄酮类化合物可以作为经典的自由基酚类抑制剂发生反应:
Piekarski,S. et al., Bulletin de la Societe Chimique de France, 1967, p. 4055 - 4062
作者:Piekarski,S. et al.
DOI:——
日期:——
Piekarski,S. et al., Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1964, vol. 259, p. 151 - 153
作者:Piekarski,S. et al.
DOI:——
日期:——
Fortes, C. C.; Chaves, M. H., Synthetic Communications, 1988, vol. 18, # 7, p. 751 - 762