- Transition metal-free intermolecular a-C-H amination of ethers at room temperature
-
We describe a new method for the intermolecular amination of the α-C-H bonds of ethers. A hypervalent iodine reagent was used as oxidant to enable the amination of cyclic and acyclic alkyl ethers with a wide range of amides, imides, and amines. The amination occurred at room temperature and without a transition metal catalyst. The method could be used to synthesize the anti-cancer prodrug Tegafur and its analogues.
- Buslov, Ivan,Hu, Xile
-
supporting information
p. 3325 - 3330
(2015/02/02)
-
- Trifluoroacetylation of amines with trifluoroacetic acid in the presence of trichloroacetonitrile and triphenylphosphine
-
We developed a mild and convenient trifluoroacetylation process for amines using a combination of trichloroacetonitrile and triphenylphosphine. The reaction that we designed is applicable to the trifluoroacetylation of a wide variety of amines, including amines with stereogenic centers, which underwent trifluoroacetylation without racemization.
- Kim, Joong-Gon,Jang, Doo Ok
-
scheme or table
p. 683 - 685
(2010/04/02)
-
- Deuterium exchange as an indicator of hydrogen bond donors and acceptors
-
Hydrogen-deuterium exchange has been used to determine the hydrogen bonding preferences of a select group of small peptides in organic solvents. This kinetic analysis permitted comparison of hydrogen bond strengths in relation to controls and also indicated the identity of both hydrogen bond donors and hydrogen bond acceptors. Copyright
- Steffel, Lauren R.,Cashman, Timothy J.,Reutershan, Michael H.,Linton, Brian R.
-
p. 12956 - 12957
(2008/09/17)
-
- A convenient trifluoroacetylation reagent: N- (trifluoroacetyl)succinimide
-
N-(Trifluoroacetyl)succinimide, easily prepared from trifluoroacetic anhydride and succinimide forms a novel, convenient trifluoroacetylating reagent. It trifluoroacetylates alcohols, phenols and mines, to generate trifluoroacetate esters, and trifluoroacetamides in excellent yields with very efficient work up procedures.
- Katritzky, Alan R.,Yang, Baozhen,Guofang, Qiu,Zhang, Zhongxing
-
-
- Phosphorus in organic synthesis. Acyloxyphosphonium salts as chemoselective acylating reagents
-
Acyloxytriphenylphosphonium salts 1 prepared in situ react with a variety of aminophenols to give the corresponding amides in excellent yields. At -25°N-acylated products are formed exclusively, whereas 0°some O-acylated products are observed. 1 is also a
- Froyen, Paul
-
p. 5359 - 5362
(2007/10/03)
-
- Conformations and Vibrational Dynamics of Six Monoalkyltrifluoroacetamides. Low-Resolution Microwave and Gas-Phase NMR Spectroscopic Studies
-
Low resolution microwave spectra of six N-alkyltrifluoroacetamides (F3C(O)NHR; r = CH3, C2H5, i-C3H7, n-C3H7, i-C4H9, t-C4H9) display band series consistent with a single species having the R group oriented syn to the carbonyl moiety. 5JH-F coupling constats observed in gas- and liquid-phase NMR spectra of N-methyltrifluoroacetamide confirm this assignment.For each molecule the observed rotational constats, anomalously broad microwave bandwidths, and absence of resolvable fine structure are consistent with predicted effects of rapid intramolecular vibrational redistribution (IVR).Sufficient state density for IVR in these molecules occurs at low internal energies.
- True, Nancy S.,Ross, Brian D.
-
p. 3216 - 3220
(2007/10/02)
-