Formation of Xanthone Oxime and Related Compounds Using a Combination of tert-Butyl Nitrite and Potassium Hexamethyldisilazide
摘要:
Synthesis of xanthone oxime and related compounds via nitrosation of the dibenzylic position using a combination of tert-butyl nitrite and potassium hexamethyldisilazide is described. The reaction conditions are effective for the synthesis of xanthone oxime as well as thioxanthone, acridone, and anthrone oximes, which have been difficult to synthesize from the corresponding ketones by conventional dehydrative condensation with hydroxylamine.
inhibitor 6‐[[(diphenylmethylene)amino]oxy]hexanoic acid 1, the following systematic structural modifications were performed: (a) formal substitution of the phenyl rings, (b) isosteric replacement of the benzene core by the heteroarenes pyridine and thiophene, (c) formal reduction of the aromatic substructure and subsequent diminution of the cyclohexyl ring, (d) introduction of methylene spacer between
Synthesis and Structure-Activity Relationships of Selected Tricyclic Oxime O-Ethers as Potential Anticholinergic Agents
作者:Vilas A. Prabhu、Robert G. Brown、Jaime N. Delgadox
DOI:10.1002/jps.2600700524
日期:1981.5
Selected isomeric and nonisomeric oximeO-ether derivatives of thioxanthone oxime were synthesized and evaluated for anticholinergic activity. The oximeO-ethers were prepared via O-alkylation of the oximate anion with appropriate aminoaklyl halides. Separation and isolation of the structural isomers were accomplished through dry-column chromatography. The racemic alpha-methyl isomer was resolved via
Access to Cyanoimines Enabled by Dual Photoredox/Copper-Catalyzed Cyanation of <i>O</i>-Acyl Oximes
作者:Hao Zhang、Ziyan Wei、Ai Hua Zhang、Shouyun Yu
DOI:10.1021/acs.orglett.0c02659
日期:2020.9.18
An efficient strategy for the synthesis of pharmaceutically important and synthetically useful cyanoimines, as well as cyanamides, has been described. This strategy is enabled by dual photoredox/copper-catalyzed cyanation of O-acyl oximes or O-acyl hydroxamides. This state of the art protocol for cyanoimines and cyanamides features readily available starting materials, mild reaction conditions, good functional group tolerance, and operational simplicity. The resultant cyanoimines can be transformed into structurally diverse and functionally important N-containing heterocycles.
163. Xanthones and thioxanthones. Part II. Derivatives of thioxanthhydrol, 9-xanthylamine, and 9-thioxanthylamine
作者:Frederick G. Mann、J. Hedley Turnbull
DOI:10.1039/jr9510000757
日期:——
Nagarajan,K. et al., Indian Journal of Chemistry, 1974, vol. 12, p. 247 - 251