Iminocarbocation intermediates were in situ-generated by treating various oximes with trifluoromethanesulfonic anhydride (Tf2O) in the presence of triethylamine in toluene and nucleophilic trapping with amines or sodium enolates under mild conditions afforded the corresponding amidines and enamines. Some of the thus-obtained enamines were converted to 2-substituted 4-oxo-3-quinolinecarboxylic acid derivatives by subsequent intramolecular Friedel–Crafts acylation.
Disclosed herein are cannabinoid receptor ligands of formula (I)
wherein A
1
, A
5
, R
x
, X
4
, and z are as defined in the specification. Compositions comprising such compounds, and methods for treating conditions and disorders using such compounds and compositions are also disclosed.
Beckmann Rearrangement of Oximes under Very Mild Conditions
作者:Lidia De Luca、Giampaolo Giacomelli、Andrea Porcheddu
DOI:10.1021/jo025960d
日期:2002.8.1
A variety of ketoximes, easily prepared from the corresponding ketones, undergo the Beckmann rearrangement upon treatment with 2,4,6-trichloro[1,3,5]triazine in N,N-dimethylformamide at room temperature in excellent yields. This procedure can be applied to aldoximes for obtaining the corresponding nitriles.
IMPROVED METHOD FOR PRODUCING SPECIFIC OXIMES AND OXIMETHERS
申请人:BAYER CROPSCIENCE Aktiengesellschaft
公开号:US20160107986A1
公开(公告)日:2016-04-21
Method for preparing certain oximes and oxime O-methyl ethers by reacting poorly water-soluble carbonyl compounds with salts of hydroxylamine or hydroxylamine O-methyl ether or the free base of hydroxylamine in the presence of certain phosphoric esters or salts thereof of the formula (I)
wherein R
1
, R
2
and X are defined as specified in the description.
From ( E )- and ( Z )-ketoximes to N -sulfenylimines, ketimines or ketones at will. Application to erythromycin derivatives
作者:Jorge Esteban、Anna M. Costa、Fèlix Urpı́、Jaume Vilarrasa
DOI:10.1016/j.tetlet.2004.06.002
日期:2004.7
disulfide (PhSSPh) have been compared to gain insight into the mechanisms involved and their potential applications. N-Sulfenylimine isomers and ketimines have been spectroscopically characterised. Both the E and Z isomers of erythromycin A oxime, when treated with Bu3P and PhSSPh (1:4:8 ratio), give the same N-phenylsulfenyl ketimine (of configuration E) as the major compound, whereas with Bu3P or