Month: December 2022

Forlani, Luciano published the artcileIntermediates in the halogenation of some 2-aminothiazoles, SDS of cas: 6972-05-0, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1978), 1169-71, database is CAplus.

Halogenations (Cl, Br, 0¡ã) of aminothiazoles I (R¹ = R² = H, RR³ = bond) (R⁴ = H, R⁵ = H, Me₂CHCH₂, PhCH₂; R⁴ = R⁵ = Me) in MeOH, EtOH, H₂O, or (HOCH₂)₂ occurred regio- and stereospecifically to give the corresponding thiazoline hydrohalides I.HR¹ (R = R² = H) (R¹ = Cl, Br; R³ = OMe, OEt, OH, OCH₂CH₂OH) (80-95%). E.g., 95% I.HR¹ (R = R² = R⁴ = R⁵ = H, R¹ = Br, R³ = OEt) was obtained by bromination of 2-aminothiazole in EtOH. The mechanism of the reaction is discussed. The halothiazoline products were converted to the corresponding 5-halothiazoles I (RR³ = bond, R¹ = halo, R² = H) on heating a few h at ?70¡ã.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, SDS of cas: 6972-05-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kaye, Perry T. published the artcileN,N-Disubstituted 2-aminothiazole-5-carboxylates: preparation and rotation of functional groups, SDS of cas: 6972-05-0, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1983), 1677-80, database is CAplus.

Fourteen new 2-(dialkylamino)thiazole-5-carboxylates were prepared by cyclocondensation of ¦Á-bromo ¦Â-oxo esters with N,N-disubstituted thioureas. Thus, cyclocondensation of HCOCHBrCO₂Et with H₂NCSNMe₂ in refluxing EtOH gave thiazole I. The IR spectra of these compounds show carbonyl doublets arising from the carbonyl O,S-syn-s-trans and anti-s-trans rotamers. Variable temp ¹H NMR study showed barriers to rotation of the 2-amino groups of 41-47 kJ/mol. There is a strong mesomeric attraction between the carboxylate and amine groups.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, SDS of cas: 6972-05-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Funnell, Richard A. published the artcileThree reactions leading to isomeric 2-(N,N-disubstituted amino)thiazol-5-yl ketones, Application In Synthesis of 6972-05-0, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1987), 2311-15, database is CAplus.

N-Imidoyl-N,N-disubstituted thioureas PhNHCR:NCSR¹ (R = CMe₃, Ph, 4-MeOC₆H₄, 4-ClC₆H₄, 2-thienyl, R¹ = NMe₂, NPhMe, pyrrolidino, piperidino, morpholino, hexahydroazepino) react with ¦Á-halo ketones R²COCH₂R³ (I, R² = Me, R³ = Cl; R² = Me, CMe₃, Ph, 4-ClC₆H₄, 4-MeOC₆H₄, 4-O₂NC₆H₄, Me₂CH, R³ = Br) in the presence of Et₃N to give the expected 2-(N,N-disubstituted amino)thiazol-5-yl ketones II in high yield. The corresponding reactions of N-acyl-N,N-disubstituted thioureas RCONHCSR¹ with I lead to mixtures of II and III, which arise from rearrangement between cyclic intermediates. Mixtures of II and III are also formed by treating N,N-disubstituted thioureas R¹CSNH₂ with 2-bromo-1,3-diketones RCOCHBrCOR². The mixtures from the second and third routes contain the same products but in significantly different proportions. A mechanistic scheme which accounts for the main findings was developed. Characteristic mass spectral fragmentation patterns were particularly useful in identifying the substituents at positions 4 and 5 of the thiazole ring.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Application In Synthesis of 6972-05-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Caldwell, Jennifer M. published the artcileStructural features and crystallographic examination of 5-acetyl- and 5-(trifluoroacetyl)-2-(N,N-disubstituted amino)thiazoles, COA of Formula: C3H8N2S, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1987), 2305-10, database is CAplus.

Title compounds I (R = H, R¹ = Me; R = Me, CMe₃, Ph, R¹ = Ph, Me) were prepared by unambiguous methods and examined spectrometrically. Crystallog. studies were carried out on 4 of the compounds and a related trifluoroacetyl compound (II). In solution I (R = H, CMe₃, Ph) exist predominantly in one conformation but I (R = Me) has two forms (carbonyl O,S-syn or anti, related by rotation of the acetyl group) of approx. equal stability. The x-ray work established that I (R = H, Ph) have carbonyl O,S-syn stereochem. whereas I (R = Me, CMe₃) have the anti arrangement. In contrast to I (R = Ph), II adopts the anti arrangement. These findings validate a correlation between the stereochem. of the rotational isomers and the positions of their carbonyl IR bands. The results also confirm the operation of a strong mesomeric interaction between the amino and acetyl groups.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, COA of Formula: C3H8N2S.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Birkinshaw, Timothy N. published the artcileSpectrometric and chemical studies of 5-acyl- and 5-nitroso-2-(N,N-disubstituted amino)thiazoles, Formula: C3H8N2S, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1988), 2209-12, database is CAplus.

The conformational preferences of title compounds I [e.g., R = NMePh, R¹ = Me, R² = Ph, (II); R = NMePh, R¹ = Ph, R² = Me] were established by IR spectrometry and a crystallog. examination of II. In solution, I (R¹ = Me, aryl; R² = aryl) exist predominantly or entirely in the carbonyl O,S-anti form; the syn rotamer is the main form of I (R¹ = aryl, R² = Me), but ?15% of the anti rotamer is present. Nitrosation of 4-aryl-2-(dimethylamino)thiazoles to the 5-nitroso derivatives is discussed, and evidence for nitroso-oximino isomerization in a similar reaction is given. The rotational barrier of the dimethylamino group is unexpectedly high (¦¤G₂₉₈? = 69 kJ mol^-1), exceeding even that of the 5-(trifluoroacetyl) analogs.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Formula: C3H8N2S.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Boudjemeline, Mehdi published the artcile[¹⁸F]ODIBO: a prosthetic group for bioorthogonal radiolabeling of macromolecules via strain-promoted alkyne-azide cycloaddition, Formula: C9H21NO3, the publication is Organic & Biomolecular Chemistry (2018), 16(3), 363-366, database is CAplus and MEDLINE.

A novel prosthetic group for the efficient radiolabeling of macromols. has been developed. [¹⁸F]oxadibenzocyclooctyne ([¹⁸F]ODIBO) is synthesized in high radiochem. yield and applied for nearly quant. conjugation to azide-tagged peptides and proteins at room temperature and low substrate concentrations The resulting bioconjugates are chem. and radiochem. pure and free of toxic solvents and catalysts.

Organic & Biomolecular Chemistry published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Formula: C9H21NO3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

McDonagh, Anthony W. published the artcileSynthesis and Evaluation of Bifunctional [2.2.2]-Cryptands for Nuclear Medicine Applications, Related Products of catalysis-chemistry, the publication is Inorganic Chemistry (2021), 60(13), 10030-10037, database is CAplus and MEDLINE.

For the first time, synthesis of bifunctional [2.2.2]-cryptands (CRYPT) and demonstration of radiolabeling with lead(II) (Pb²⁺) isotopes are disclosed herein. The synthesis is convenient and high-yielding and gives access to three distinct bifunctional handles (azide (-N₃), isothiocyanate (-NCS), and tetrazine (-Tz)) that can enable the construction of radioimmunoconjugates for targeted and pretargeted therapy. Proof-of-principle CRYPT radiolabeling was successful with lead-203 ([²⁰³Pb]Pb²⁺) and demonstrated complexation efficiency superior to that of DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) and efficiency comparable to that of the current industry standard TCMC (1,4,7,10-tetraaza-1,4,7,10-tetra-(2-carbamoylmethyl)-cyclododecane). In vitro human serum stability assays demonstrated excellent [²⁰³Pb]Pb-CRYPT stability over 72 h (91.7 ¡À 0.56%; n = 3). [²⁰³Pb]Pb-CRYPT-radioimmunoconjugates were synthesized from the corresponding CRYPT-immunoconjugate or by conjugating [²⁰³Pb]Pb-Tz-CRYPT to transcyclooctene modified trastuzumab (TCO-trastuzumab) via the inverse electron-demand Diels-Alder (IEEDA) reaction. This investigation reveals the potential for CRYPT ligands to become new industry standards for therapeutic and diagnostic radiometals in radiopharmaceutical elaboration.

Inorganic Chemistry published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Spears, Richard J. published the artcileA novel thiol-labile cysteine protecting group for peptide synthesis based on a pyridazinedione (PD) scaffold, HPLC of Formula: 71989-31-6, the publication is Chemical Communications (Cambridge, United Kingdom) (2022), 58(5), 645-648, database is CAplus and MEDLINE.

Herein we report a thiol-labile cysteine protecting group based on an unsaturated pyridazinedione (PD) scaffold. We establish compatibility of the PD in conventional solid phase peptide synthesis (SPPS), showcasing this in the on-resin synthesis of biol. relevant oxytocin. Furthermore, we establish the applicability of the PD protecting group towards both microwave-assisted SPPS and native chem. ligation (NCL) in a model system.

Chemical Communications (Cambridge, United Kingdom) published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C11H21BF4N2O2, HPLC of Formula: 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Nguyen, Suong T. published the artcileDepolymerization of Hydroxylated Polymers via Light-Driven C-C Bond Cleavage, Formula: C15H24S, the publication is Journal of the American Chemical Society (2021), 143(31), 12268-12277, database is CAplus and MEDLINE.

The accumulation of persistent plastic waste in the environment is widely recognized as an ecol. crisis. New chem. technologies are necessary both to recycle existing plastic waste streams into high-value chem. feedstocks and to develop next-generation materials that are degradable by design. Here, we report a catalytic methodol. for the depolymerization of a com. phenoxy resin and high mol. weight hydroxylated polyolefin derivatives upon visible light irradiation near ambient temperature Proton-coupled electron transfer (PCET) activation of hydroxyl groups periodically spaced along the polymer backbone furnishes reactive alkoxy radicals that promote chain fragmentation through C-C bond ¦Â-scission. The depolymerization produces well-defined and isolable product mixtures that are readily diversified to polycondensation monomers. In addition to controlling depolymerization, the hydroxyl group modulates the thermomech. properties of these polyolefin derivatives, yielding materials with diverse properties. These results demonstrate a new approach to polymer recycling based on light-driven C-C bond cleavage that has the potential to establish new links within a circular polymer economy and influence the development of new degradable-by-design polyolefin materials.

Journal of the American Chemical Society published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Formula: C15H24S.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Hunter, Luke published the artcileSynthesis of the ¦Â-hydroxydopa-¦Ã-hydroxy-¦Ä-sulfinylnorvaline component of ustiloxins A and B, Computed Properties of 77189-99-2, the publication is Organic & Biomolecular Chemistry (2005), 3(5), 732-734, database is CAplus and MEDLINE.

The ustiloxins are family of cyclic peptides isolated from fungus Ustilaginoidea virens. The dopa-sulfinylnorvaline component of ustiloxins A and B (I, BOC = tert-butoxycarbonyl) has been prepared using an Evans salen-Al-catalyzed aldol reaction of an oxazole derivative with a 6-mercaptoisovanillin derivative to generate the ¦Â-hydroxydopa portion (aldol adduct II), followed by substitution of bromolactone with the thiophenolate generated sulfide and asym. oxidation of the resulting sulfide to give the corresponding sulfoxide.

Organic & Biomolecular Chemistry published new progress about 77189-99-2. 77189-99-2 belongs to catalysis-chemistry, auxiliary class Thiophenol,Benzene,Ether, name is 2,4,6-Trimethoxybenzenethiol, and the molecular formula is C9H12O3S, Computed Properties of 77189-99-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia