Synthesis and Use of 2H-Azirin-3-amines as Dipeptide Synthons
摘要:
The synthesis of the new 2H-azirin-3-amines ('3-amino-2H-azirines') 11, 20, 28, and 33 as dipeptide synthons is described. The reactions of the starting amides with Lawesson reagent gave the corresponding thioamides, and consecutive treatment with COCl2, 1,4-diazabicyclo[2.2.2]octane (DABCO), and NaN3 led to the desired products. It is shown that these 2H-azirin-3-amines can conveniently be used as building blocks of the dipeptides Aib-(Me)Axx (Axx = alanine, valine), Aib-Homoproline, and Iva-Pro in the synthesis of several model peptides. However, some limitations apply for the synthesis of such 2H-azirin-3-amines. The starting material for the azirine synthesis, the corresponding thioamides, cannot generally be synthesized, and the 2H-azirin-3-amines could not be obtained in all cases from the thioamides prepared.
Synthesis and Use of 2H-Azirin-3-amines as Dipeptide Synthons
摘要:
The synthesis of the new 2H-azirin-3-amines ('3-amino-2H-azirines') 11, 20, 28, and 33 as dipeptide synthons is described. The reactions of the starting amides with Lawesson reagent gave the corresponding thioamides, and consecutive treatment with COCl2, 1,4-diazabicyclo[2.2.2]octane (DABCO), and NaN3 led to the desired products. It is shown that these 2H-azirin-3-amines can conveniently be used as building blocks of the dipeptides Aib-(Me)Axx (Axx = alanine, valine), Aib-Homoproline, and Iva-Pro in the synthesis of several model peptides. However, some limitations apply for the synthesis of such 2H-azirin-3-amines. The starting material for the azirine synthesis, the corresponding thioamides, cannot generally be synthesized, and the 2H-azirin-3-amines could not be obtained in all cases from the thioamides prepared.
[EN] SUBSTITUTED 1,3-PHENYL HETEROARYL DERIVATIVES AND THEIR USE IN THE TREATMENT OF DISEASE<br/>[FR] DÉRIVÉS DE 1,3-PHÉNYL HÉTÉROARYLE SUBSTITUÉS ET LEUR UTILISATION DANS LE TRAITEMENT D'UNE MALADIE
申请人:NOVARTIS AG
公开号:WO2021038426A1
公开(公告)日:2021-03-04
The invention relates to heterocyclic compounds of the formula (I) in which all of the variables are as defined in the specification; capable of modulating the ctivity of TMEM16a. The invention further provides a method for manufacturing compounds of the invention, and its therapeutic uses. The invention further provides methods to their preparation, to their medical use, in particular to their use in the treatment and management of diseases or disorders including COPD, bronchiectasis, asthma, cystic fibrosis, primary ciliary dyskinesia, chronic bronchitis, cystic fibrosis, primary ciliary dyskinesia, respiratory tract infections (acute and chronic; viral and bacterial), lung carcinoma.
replaces the pharmacophore’s oxycarbonyl by an amide group, displays improved potency as an inhibitor of cancer cell proliferation, as a regulator of alternative splicing in cultured cells and as an inhibitor of in vitro spliceosome assembly. Sudemycin K displays higher stability, likely related to the replacement of the oxycarbonyl group, which can be a substrate of esterases, by an amide group. The activity
Acylation reactions mediated by tantalum carboxylates
作者:Kiran Joshi、Jiang Bao、Alan S. Goldman、Joachim Kohn
DOI:10.1021/ja00043a006
日期:1992.8
Facile nucleophilic attack on coordinated carboxylate ligands is reported: complexes of tantalum(V) react rapidly with amines and amino acid esters to give the corresponding amides. Cyclopentadienyltantalum(V) amino acid carboxylate complexes have been prepared and reacted with free amino acid esters to give dipeptides in good yield and with high stereochemical purity.