DOTMA-based amides (DOTMAMs) as a platform for the development of PARACEST MRI contrast agents
作者:M. Suchý、A. X. Li、M. Milne、R. Bartha、R. H. E. Hudson
DOI:10.1039/c6ra11741d
日期:——
DOTMA-based secondary amides (DOTMAMs) has been developed. Alkylation of cyclen with L-lactic acid-derived pseudohalides was used as a key step affording the alkyl- and aryl-decorated DOTMAMs. Amino acid-decorated DOTMAMs were obtained via peptide coupling between DOTMA and protected amino acids. Metallation of the DOTMAMs ligand with Tm3+ gave complexes exhibiting proximal amide proton based paramagnetic
Chiral amides obtained from (±)-2-chloropropionate esters and a wide range of amines when the reaction is catalysed by lipase. The enantioselection of the enzyme in this aminolysis reaction depends on the substrate and nucleophile structure and reaction conditions. This lipase can catalyze a transamidation reaction if N-trifluoroethyl-2-chloropropionamide is used as substrate. In this way, amides are
Yeast lipase () catalysed the reaction between ethyl (±)-2-chloropropionate and different aliphatic and aromatic amines yielding optically active amides.
酵母脂肪酶()催化(±)-2-氯丙酸乙酯与不同的脂肪族和芳香族胺之间的反应,从而产生光学活性酰胺。
Control of enantioselectivity in the formation of a model alaninamide from a 2-bromopropanamide
Lipase catalysed synthesis of optically enriched α-haloamides
作者:A Azim
DOI:10.1016/s0968-0896(01)00006-2
日期:2001.5
An efficient lipase catalysed synthesis of optically enriched alpha -halogenated amides with concomitant optical enrichment of the starting alpha -haloesters is described. Candida antarctica lipase (CAL) was found to be a better catalyst over porcine pancreatic lipase (PPL) and Candida cylindracea lipase (CCL). The effect of different organic solvents was also studied. (C) 2001 Elsevier Science Ltd. All rights reserved.