The: Ortho -substituent on 2,4-bis(trifluoromethyl)phenylboronic acid catalyzed dehydrative condensation between carboxylic acids and amines
2,4-Bis(trifluoromethyl)phenylboronic acid is a highly effective catalyst for dehydrative amidation between carboxylic acids and amines. Mechanistic studies suggest that a 2:2 mixed anhydride is expected to be the only active species, and the ortho-substituent of boronic acid plays a key role in preventing the coordination of amines to the boron atom of the active species, thus accelerating the amidation. This catalyst works for α-dipeptide synthesis.
Wang, Ke,Lu, Yanhui,Ishihara, Kazuaki
p. 5410 - 5413
(2018/05/30)
CATALYTIC ASYMMETRIC SYNTHESIS OF DIPEPTIDES FROM 2-TRIFLUOROMETHYL-Δ2- AND 2-TRIFLUOROMETHYL-Δ3-OXAZOLIN-5-ONES
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Bitiev, Sh. G.,Chel'tsova, G. V.,Lutsenko, M. R.,Karpeiskaya, E. I.,Klabunovskii, E. I.
p. 339 - 345
(2007/10/02)
DIASTEREOSELECTIVE HYDROGENATION OF METHYL ESTERS OF TRIFLUOROACETYLDEHYDROPHENYLALANYL DIPEPTIDES AND TRIFLUOROACETYLDEHYDROVALYL DIPEPTIDES
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Bitiev, Sh. G.,Chel'tsova-Bebutova, G. V.,Karpeiskaya, E. I.,Klabunovskii, E. I.
p. 1472 - 1475
(2007/10/02)
Chiral Environments for Asymmetric Hydrogenation of Model Didehydro-Amino Acid Residues
Nmr and glc analysis of diastereoisomeric mixtures of dipeptides has been used to study the asymmetric hydrogenation of model benzoyldidehydro- and trifluoroacetyldidehydro-dipeptide methyl esters.Chiral enhancement of one isomeric form appears to be inde
Davies, John S.,Eaton, Mark C.,Ibrahim, M. Nazar
p. 1813 - 1814
(2007/10/02)
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