3695-77-0Relevant articles and documents
Sulfenyl chloride chemistry, sulfur transfer to double bonds
Abu-Yousef,Hynes,Harpp
, p. 4289 - 4292 (1993)
When triphenylmethanesulfenyl chloride (1) (or its thio homolog 2) are treated with various bicycles, 1,2 addition reactions take place. Final products occur via an episulfide intermediate. The stereochemistry of addition has been determined by x-ray analysis. Finally, evidence has been obtained for the delivery of diatomic sulfur, likely via intermediate 3.
Synthesis and Reactivity of Cp?IrIII Complexes with a C-S Chelate Displaying Metal/Sulfur Bifunctionality
Yamamoto, Naoki,Sato, Yasuhiro,Kayaki, Yoshihito,Ikariya, Takao
, p. 3342 - 3352 (2018)
A half-sandwich thiolatoiridium complex bearing a five-membered C-S chelating ligand has been synthesized via cyclometalation of triphenylmethyl mercaptan. The thiametallacycle crystallizes as a coordinatively saturated dimer, bridged with the thiolato ligand. Two-electron donors, such as phosphines and CO, readily coordinate to the thiametallacycle having a bimetallic core to afford the corresponding mononuclear C-S chelating thiolato complexes. The thiolato moiety is alkylated with electrophilic organic halides, including methyl iodide, benzyl bromide, and allyl halides, to yield the corresponding mononuclear thioether complexes in a stereoselective manner that validates the nucleophilic character of the coordinating sulfur atom on the thiairidacycle. By treatment of the dinuclear complex with alkynes, the carbon-carbon triple bonds insert into the thiolato-metal bond selectively to give the corresponding tridentate thioether complexes having a metal-sulfur bond. The insertion of unsymmetrical acetylenecarboxylates provides regioselective adducts where the ester substituent attaches to a carbon bound to the metal center, implying that the nucleophilic sulfur atom attacks the electrophilic β-carbon on the unsaturated ester.
Immobilization by Surface Conjugation of Cyclic Peptides for Effective Mimicry of the HCV-Envelope E2 Protein as a Strategy toward Synthetic Vaccines
Meuleman, Theodorus J.,Dunlop, James I.,Owsianka, Anna M.,Van De Langemheen, Helmus,Patel, Arvind H.,Liskamp, Rob M. J.
, p. 1091 - 1101 (2018)
Mimicry of the binding interface of antibody-antigen interactions using peptide-based modulators (i.e., epitope mimics) has promising applications for vaccine design. These epitope mimics can be synthesized in a streamlined and straightforward fashion, thereby allowing for high-throughput analysis. The design of epitope mimics is highly influenced by their spatial configuration and structural conformation. It is widely assumed that for proper mimicry sufficient conformational constraints have to be implemented. This paper describes the synthesis of bromide derivatives functionalized with a flexible TEG linker equipped with a thiol-moiety that could be used to support cyclic or linear peptides. The cyclic and linear epitope mimics were covalently conjugated via the free thiol-moiety on maleimide-activated plate surfaces. The resulting covalent, uniform, and oriented coated surface of cyclic or linear epitope mimics were subjected to an ELISA to investigate the effect of peptide cyclization with respect to mimicry of an antigen-antibody interaction of the HCV E2 glycoprotein. To the best of our knowledge, the benefit of cyclized peptides over linear peptides has been clearly demonstrated here for the first time. Cyclic epitope mimics, and not the linear epitope mimics, demonstrated specificity toward their monoclonal antibodies HC84.1 and V3.2, respectively. The described strategy for the construction of epitope mimics shows potential for high-throughput screening of key binding residues by simply changing the amino acid sequences within synthetic peptides. In this way, leucine-438 has been identified as a key binding residue for binding monoclonal antibody V3.2.
A mild and selective protecting and reversed modification of thiols
Li, Xiangmin,Li, Hongxian,Yang, Wei,Zhuang, Jinchen,Li, Hao,Wang, Wei
supporting information, p. 2660 - 2663 (2016/06/01)
One selective thiol-protecting study has been investigated for a wide range of thiols including general thiols and thiols containing multiple functional groups. The reactions of bromomaleimides and thiols under the mild condition afforded the protected products in excellent yields. The thiols can be recovered very quickly using dithiothreitol (DTT) under the mild condition.
A [...] analogs, its preparation process and its application
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Paragraph 0057-0060, (2016/10/08)
The invention discloses a largazole analogue which contains alkyl disulfide side chains and is represented by formula I, and a preparation method and applications thereof. The largazole analogue possesses relatively high antineoplastic activity and selectivity, can be used for development of antitumor drugs. Raw materials of the largazole analogue are cheap and easily available; and the preparation method is simple, and is a method suitable for industrialization. R in formula represents an alkyl group containing 1 to 8 carbon atoms.
Understanding hydrogen sulfide storage: Probing conditions for sulfide release from hydrodisulfides
Bailey, T. Spencer,Zakharov, Lev N.,Pluth, Michael D.
supporting information, p. 10573 - 10576 (2014/08/18)
Hydrogen sulfide (H2S) is an important biological signaling agent that exerts action on numerous (patho)physiological processes. Once generated, H2S can be oxidized to generate reductant-labile sulfane sulfur pools, which include hydrodisulfides/persulfides. Despite the importance of hydrodisulfides in H2S storage and signaling, little is known about the physical properties or chemical reactivity of these compounds. We report here the synthesis, isolation, and characterization (NMR, IR, Raman, HRMS, X-ray) of a small-molecule hydrodisulfide and highlight its reactivity with reductants, nucleophiles, electrophiles, acids, and bases. Our experimental results establish that hydrodisulfides release H2S upon reduction and that deprotonation results in disproportionation to the parent thiol and S0, thus providing a mechanism for transsulfuration in the sulfane sulfur pool.
[[(tert-Butyl)dimethylsilyl]oxy]-methylGroup for sulfur protection
Wang, Lihong,Clive, Derrick L. J.
supporting information; experimental part, p. 1734 - 1737 (2011/06/09)
Aromatic and aliphatic thiols can be protected by reaction with t-BuMe 2SiOCH2Cl in DMF in the presence of a base (2,6-lutidine or proton sponge); the resulting t-BuMe2SiOCH2SR or t-BuMe2SiOCH2SAr are deprotected by sequential treatment with Bu4NF and I2 to give symmetrical disulfides. Another mode of deprotection involves reaction with a sulfenyl chloride; this process gives an unsymmetrical disulfide and was examined with Me(CH2) 11SCH2OSiMe2Bu-t and three sulfenyl chlorides.
Thioacetate deprotection
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Sheet 1/2, (2008/06/13)
A method of thioacetate deprotection by providing a compound of the formula R1—S—CO—R2, and reacting the compound with a quaternary ammonium cyanide salt in the presence of a protic solvent in an inert atmosphere to convert the compound to a product of the formula R1—SH. R1 is an organic group in which the bonding to sulfur is through a saturated carbon, and R2 is an aliphatic group.
Aliphatic thioacetate deprotection using catalytic tetrabutylammonium cyanide
Holmes, Brian T.,Snow, Arthur W.
, p. 12339 - 12342 (2007/10/03)
A series of thiol-functionalized organic compounds were selected to analyze the scope and efficiency of a new thioacetate deprotection method using catalytic tetrabutylammonium cyanide (TBACN) to effect the transformation of a thioacetate group to a free thiol in the presence of a protic solvent. Particularly attractive are the mild reaction and workup conditions, reduced byproduct formation typically seen using literature methods and yields of greater than 80% for the free aliphatic thiols. This method is effective on aliphatic thiols with trityl, benzyl, p-halo-benzyl, phenethyl, phenoxyethyl, and cyclohexylethyl structural moieties, but it is not effective with thiophenols.
Thioester analogues of peptidoglycan fragment MurNAc-L-Ala-γ-D-Glu as substrates for peptidoglycan hydrolase MurNAc-L-Ala amidase
Harding, Ross L.,Henshaw, Joanne,Tilling, Joannah,Bugg, Timothy D.H.
, p. 1714 - 1722 (2007/10/03)
MurNAc-L-amidase is one of a family of peptidoglycan hydrolases which catalyses the breakdown of bacterial peptidoglycan. Analogues of the peptidoglycan fragment MurNAc-L-Ala-γ-D-Glu containing S-thiolactic acid in place of L-alanine were synthesised as thioester substrates for this enzyme. Triphenylmethanethiol was used to develop a stereoselective synthesis of S-thiolactic acid, which was elaborated synthetically into MurNAc-dipeptide analogues. MurNAc-S-thioacetyl-N-propylamide 13 and MurNAc-S-thiolactyl-2R-alaninamide 16 were found not to be substrates for recombinant MurNAc-L-Ala amidases CwlA from Bacillus subtilis and Ply21 from bacteriophage TP21, however, turnover of tripeptide thioester S-propionylthiolactyl-γ-D-Glu-L-Lys-OMe 21 was observed using amidase Ply21. Therefore, recognition of the amino acid at position 3 of the pentapeptide sidechain appears to be important for enzymatic turnover.
