Selective synthesis of bis[1,2]dithiolo[1,4]thiazines from 4-isopropylamino-5-chloro-1,2-dithiole-3-ones
摘要:
Reaction of 4-isopi-opylamiiio-5-chloro-1,2-dithiole-3-oiies 3 and S2Cl2 in acetonitrile gave selectively 3-oxo-bis[1,2]dithiolo[1,4]tliiazine-5-tiliones I by the addition of triethylamine and bis[1,2]dithiolo[1,4]thiazine-3,5-diones 5 under the action of formic acid. 3,5-Diones 5 were also obtained by intramolecular cyclization of N,N-bis(5-chloro-3-oxo[1,2]dithiol-4-yl)amines 6 with S,Cl, in the presence of Et3N. (c) 2007 Elsevier Ltd. All rights reserved.
Well-Defined Diimine Copper(I) Complexes as Catalysts in Click Azide-Alkyne Cycloaddition Reactions
作者:Jordi Barta、Silvia Díez-González
DOI:10.3390/molecules18088919
日期:——
A series of 1,4-disubstituted 1,2,3-triazoles have been prepared in high yields while respecting the stringent Click criteria. In these reactions, highly stable pre-formed complexes bearing diimine ligands were used.
Reusable and highly active supported copper(i)–NHC catalysts for Click chemistry
作者:John-Michael Collinson、James D. E. T. Wilton-Ely、Silvia Díez-González
DOI:10.1039/c3cc44371j
日期:——
Immobilised [Cu(NHC)] catalysts are reported for the preparation of 1,2,3-triazoles. In addition to showing outstanding catalytic activity, the catalyst systems are easy to prepare and can be recycled many times.
Transformations of N-ethylamines into amide derivatives under the action of sulfur monochloride
作者:L. S. Konstantinova、A. A. Berezin、O. A. Rakitin
DOI:10.1007/s11172-007-0179-9
日期:2007.6
Tertiary N-ethylamines were converted into amide derivatives by reactions with sulfurmonochloride and DABCO at 0 °C. Depending on the nature of the substituents in the amine, the reaction can be accompanied by unexpected transformations.
通过在 0 °C 下与一氯化硫和 DABCO 反应,将叔 N-乙胺转化为酰胺衍生物。根据胺中取代基的性质,该反应可能伴随着意想不到的转变。
The synthetic tuning of clickable pH responsive cationic polypeptides and block copolypeptides
作者:Amanda C. Engler、Daniel K. Bonner、Hilda G. Buss、Eva Y. Cheung、Paula T. Hammond
DOI:10.1039/c1sm05064h
日期:——
A series of pH responsive synthetic polypeptides has been developed based on an N-carboxyanhydride ring opening polymerization combined with a facile and versatile click chemistry. Poly(γ-propargyl L-glutamate) (PPLG) homopolymers and poly(ethylene glycol-b-γ-propargyl L-glutamate) (PEG-b-PPLG) block copolymers were substituted with various amine moieties that range in pKa and hydrophobicity, providing the basis for a library of new synthetic structures that can be tuned for specific interactions and responsive behaviors. These amine-functionalized polypeptides have the ability to change solubility, or reversibly self-assemble into micelles with changes in the degree of ionization; they also adopt an α-helical structure at biologically relevant pHs. Here we characterize the pH responsive behavior of the new polypeptides and the hydrolysis of the ester containing amine side chains. We examine the reversible micellization with block copolymers of the polypeptides and nucleic acid encapsulation that demonstrate the potential use of these materials for systemic drug and gene delivery.
Synthesis of 5-mercapto-1,2-dithiole-3-thiones and their transformation into 5-chloro-1,2-dithiol-3-ones
作者:L. S. Konstantinova、A. A. Berezin、K. A. Lysov、O. A. Rakitin
DOI:10.1007/s11172-006-0228-9
日期:2006.1
A number of 4-dialkylamino-5-mercapto-1,2-dithiole-3-thiones were synthesized by reactions of alkyl(diisopropyl)amines with S2Cl2. Their reactions with S2Cl2—DABCO unexpectedly gave 5-chloro-4-dialkylamino-1,2-dithiol-3-ones.