Facile synthesis of 1,2,3-tricarbonyls from 1,3-dicarbonyls mediated by cerium(IV) ammonium nitrate
作者:Akhil Sivan、Ani Deepthi
DOI:10.1016/j.tetlet.2014.01.145
日期:2014.3
A mild and efficient protocol for the synthesis of vicinal tricarbonyl compounds from β-dicarbonyls in a single step using cerium(IV) ammoniumnitrate as a catalytic oxidant is described. Ease of execution, wide substrate scope and the suitability for the synthesis of commercially important compounds like ninhydrin, alloxan and oxoline make this reaction particularly noteworthy.
Die Herstellung folgender Pterine wird beschrieben: 2-Äthyl-thio-6-oxypteridin, 2-Äthylthio-6-oxy-8,9-diphenylpteridin, 2-Äthyl-thio-6-oxy-8,9-dimethylpteridin, 2-Äthylthio-6-oxy-8,9-phenanthreno-pteridin, 2-Äthylthio-6-oxy-8,9-acenaphtenopteridin, 6-Amino-iso-xanthopterin-carbonsäure, Desimino-isoxanthopterincarbonsäure.
Der Herstellung Flinderender Pterine wird beschrieben:2-Äthylthio-6-oxypteridin,2-Äthylthio-6-oxy-8,9-diphenylpteridin,2-Äthylthio-6-oxy-8,9-dimethylpteridin,2-Äthylthio -6-氧-8,9-菲-蝶啶,2-Äthylthio-6-氧-8,9-ena烯蝶呤,6-氨基-异黄an呤碳素,Desimino-异黄th素碳素。
A modular, low footprint and scalable flow platform for the expedient α-aminohydroxylation of enolizable ketones
作者:Victor-Emmanuel H. Kassin、Romain Morodo、Thomas Toupy、Isaline Jacquemin、Kristof Van Hecke、Raphaël Robiette、Jean-Christophe M. Monbaliu
DOI:10.1039/d0gc04395h
日期:——
reactivity profile of α-chloronitroso derivatives is expressed to its fullest potential through the development of an integrated, modular and scalable continuous flow process for the electrophilic α-aminohydroxylation of various enolizable ketones. Flow conditions contribute to mitigating the high reactivity and toxicity of α-chloronitroso derivatives and provide an efficient, versatile and safe protocol for
I<sub>2</sub>-Catalyzed Direct α-Hydroxylation of β-Dicarbonyl Compounds with Atmospheric Oxygen under Photoirradiation
作者:Chun-Bao Miao、Yan-Hong Wang、Meng-Lei Xing、Xin-Wei Lu、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1021/jo401866p
日期:2013.11.15
An I2-catalyzed hydroxylation of β-dicarbonyl moieties using air as the oxidant under photoirradiation has been developed for the easy preparation of α-hydroxy-β-dicarbonyl compounds. The transformation was completed with only 1 mol % of I2. With α-unsubstituted malonates, the hydroxylated dimerization product was afforded as the predominant product along with a minor product, α,α-dihydroxyl malonate
High-Performance Liquid Chromatographic Analysis of Amino Acids in Ackee Fruit with Emphasis on the Toxic Amino Acid Hypoglycin A
作者:K. D. Golden、O. J. Williams、Y. Bailey-Shaw
DOI:10.1093/chromsci/40.8.441
日期:2002.9.1
High-performance liquid chromatography is used to determine the amino acid content of ripe and unripe ackee fruit. Specific emphasis is placed on the level of the toxic amino acid hypoglycin A (hyp-A) in the unripe and ripe ackee fruit and seed. Unripe samples are found to contain significantly higher quantities (P < 0.05) of hyp-A when compared with ripe samples. Uncooked unripe fruit is found to contain 124.4 ± 6.7 mg/100 g fresh weight and uncooked ripe fruit 6.4 ± 1.1 mg/100 g fresh weight. The seed of the uncooked unripe fruit is found to contain 142.8 ± 8.8 mg/100 g fresh weight, and the seed of uncooked ripe fruit has 106.0 ± 5.4 mg/100 g fresh weight. Boiling fruit in water for approximately 30 min is efficient in removing hyp-A from the edible arilli; however, low levels of 0.54 ± 0.15 mg/200 mL are detected in the water that was used to cook the ripe fruit. The average %recovery of the amino acids was 80.34%.