Category: indole-building-block

Romagnoli, Romeo published the artcileDiscovery of 8-methoxypyrazino[1,2-a]indole as a new potent antiproliferative agent against human leukemia K562 cells. a structure-activity relationship study, Name: Ethyl 7-methoxy-1H-indole-2-carboxylate, the publication is Letters in Drug Design & Discovery (2009), 6(4), 298-303, database is CAplus and MEDLINE.

Identification of novel and selective anticancer agents remains an important and challenging goal in pharmacol. research. The indole nucleus, frequently encountered as a mol. fragment in natural products and pharmaceutically active compounds, was employed as the initial building block for the synthesis of a series of pyrazino[1,2-a]indoles 1a-k, variably substituted at the 6, 7, 8 and 9-positions. Compound 1e (I), bearing the methoxy group at the 8-position of the pyrazino[1,2-a]indole nucleus was identified as a novel potent antiproliferative agent against the human chronic myelogenous leukemia K562 cell line, but it was much less active against several other cancer cell lines. Comparison of positional isomers indicated that moving the methoxy group from the 8- to the 7- or 6-position, to furnish compounds 1f and 1g, resp., yielded inactive compounds The anal. of structure-activity relationships observed in the series of investigated compounds may represent the basis for the design of more active mols.

Letters in Drug Design & Discovery published new progress about 20538-12-9. 20538-12-9 belongs to indole-building-block, auxiliary class Indole,Ester,Ether, name is Ethyl 7-methoxy-1H-indole-2-carboxylate, and the molecular formula is C12H13NO3, Name: Ethyl 7-methoxy-1H-indole-2-carboxylate.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Favalli, Nicholas published the artcileScreening of Three Transition Metal-Mediated Reactions Compatible with DNA-Encoded Chemical Libraries, Application of 6-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole, the publication is Helvetica Chimica Acta (2019), 102(4), n/a, database is CAplus and MEDLINE.

The construction of DNA-encoded chem. libraries (DECLs) crucially relies on the availability of chem. reactions, which are DNA-compatible and which exhibit high conversion rates for a large number of diverse substrates. In this work, we present our optimization and validation procedures for three copper and palladium-catalyzed reactions (Suzuki cross-coupling, Sonogashira cross-coupling, and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC)), which have been successfully used by our group for the construction of large encoded libraries.

Helvetica Chimica Acta published new progress about 642494-36-8. 642494-36-8 belongs to indole-building-block, auxiliary class Indole,Boronic acid and ester,Indole,Boronate Esters,Boronic acid and ester, name is 6-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole, and the molecular formula is C14H18BNO2, Application of 6-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Godwin, Colin D. published the artcileThe Bruton′s tyrosine kinase inhibitor ibrutinib abrogates bispecific antibody-mediated T-cell cytotoxicity, Application of SU6656, the publication is British Journal of Haematology (2020), 189(1), e9-e13, database is CAplus and MEDLINE.

This study examined the abrogation of bispecific antibody (BiAb)-mediated T-cell cytotoxicity by Bruton′s tyrosine kinase inhibitor (BTKi) ibrutinib. Results suggests that ibrutinib-mediated inhibition of BiAb-mediated cancer cell killing is due to an inhibitory effect on T-cell effector function rather than induction of leukemia cell resistance. Together, the studies indicate acute exposure to BTKi impairs T-cell activation and lysis of target cells upon treatment with CD3-directed BiAbs, at least partially due to effects that are independent of BTK inhibition. Further mechanistic studies will be necessary to identify which signaling pathways are involved in this inhibitory effect of BTKi.

British Journal of Haematology published new progress about 330161-87-0. 330161-87-0 belongs to indole-building-block, auxiliary class Protein Tyrosine Kinase/RTK,Src, name is SU6656, and the molecular formula is C19H21N3O3S, Application of SU6656.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Biswas, Subhasish published the artcileOne-Step Synthesis of 2-Amino-5H-pyrimido[5,4-b]indoles, Substituted 2-(1,3,5-triazin-2-yl)-1H-indoles, and 1,3,5-Triazines from Aldehydes, Recommanded Product: 5-Fluoro-1H-indole-2-carbaldehyde, the publication is European Journal of Organic Chemistry (2012), 2012(18), 3492-3499, S3492/1-S3492/20, database is CAplus.

An efficient one-step synthesis of 2-amino-5H-pyrimido[5,4-b]indoles through a copper-catalyzed cascade reaction between 3-haloindole-2-carbaldehydes and guanidine hydrochloride is described. In contrast, the base-mediated reactions of either 3-haloindole-2-carbaldehydes or substituted indole-2-carbaldehydes with substituted amidine hydrochlorides in DMSO result in the formation of 2-(1,3,5-triazin-2-yl)-1H-indole derivatives in one step in excellent yields. Studies toward exploring the utility of the method demonstrate that even substituted benzaldehydes undergo a similar reaction to efficiently yield 2,4,6-trisubstituted 1,3,5-triazines. A plausible mechanism for the formation of substituted 1,3,5-triazines identifies the role of DMSO as an oxidant during the reaction.

European Journal of Organic Chemistry published new progress about 220943-23-7. 220943-23-7 belongs to indole-building-block, auxiliary class Indole,Fluoride,Aldehyde, name is 5-Fluoro-1H-indole-2-carbaldehyde, and the molecular formula is C9H6FNO, Recommanded Product: 5-Fluoro-1H-indole-2-carbaldehyde.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Bowroju, Suresh Kuarm published the artcileI₂/DMSO-catalyzed one-pot approach for the synthesis of 1,3,4-selenadiazoles, HPLC of Formula: 220943-23-7, the publication is RSC Advances (2021), 11(10), 5724-5728, database is CAplus and MEDLINE.

A three-component cascade reaction for the synthesis of 1,3,4-selenadiazoles and their derivatives from arylaldehydes, hydrazine, and elemental selenium by using mol. iodine wais reported. This strategy was operationally simple, well-suited to a wide range of functional groups, and provided the desired products in moderate to excellent yields. The proposed mechanism predicted that the reaction tolerated a radical process.

RSC Advances published new progress about 220943-23-7. 220943-23-7 belongs to indole-building-block, auxiliary class Indole,Fluoride,Aldehyde, name is 5-Fluoro-1H-indole-2-carbaldehyde, and the molecular formula is C9H6FNO, HPLC of Formula: 220943-23-7.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Uno, Tetsuo published the artcileNew submonomers for poly N-substituted glycines (peptoids), Application of tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate, the publication is Tetrahedron Letters (1999), 40(8), 1475-1478, database is CAplus.

Five protected submonomers for peptoid synthesis were prepared, i.e., Nⁱⁿ-BOC-tryptamine, O-t-butyltyramine, PMC-guanidino-propylamine, 6-amino-6-deoxy-D-galactopyranose diacetonide, and 5-amino-2,2-dimethyl-1,3-dioxane. The first three mimic natural amino acid side chains, i.e., tryptophan, tyrosine, and arginine, while the last two provide hydrophilic side chains. These submonomers were successfully used for preparation of oligo-peptoids by the submonomer synthesis method.

Tetrahedron Letters published new progress about 167015-84-1. 167015-84-1 belongs to indole-building-block, auxiliary class Indols, name is tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate, and the molecular formula is C7H16Cl2Si, Application of tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Newar, Rajashree published the artcileSingle-Site Cobalt-Catalyst Ligated with Pyridylimine-Functionalized Metal-Organic Frameworks for Arene and Benzylic Borylation, Quality Control of 919119-59-8, the publication is Inorganic Chemistry (2020), 59(15), 10473-10481, database is CAplus and MEDLINE.

A highly active single-site heterogeneous cobalt-catalyst is reported based on a porous and robust pyridylimine-functionalized metal-organic frameworks (pyrim-MOF) for chemoselective borylation of arene and benzylic C-H bonds. The pyrim-MOF having UiO-68 topol., constructed from zirconium-cluster secondary building units and pyridylimine-functionalized dicarboxylate bridging linkers, was metalated with CoCl₂ followed by treatment of NaEt₃BH to give the cobalt-functionalized MOF-catalyst (pyrim-MOF-Co). Pyrim-MOF-Co has a broad substrate scope, allowing the C-H borylation of halogen-, alkoxy-, alkyl-substituted arenes as well as heterocyclic ring systems using B₂pin₂ or HBpin (pin = pinacolate) as the borylating agent to afford the corresponding arene- or alkyl-boronate esters in good yields. Pyrim-MOF-Co gave a turnover number (TON) of up to 2500 and could be recycled and reused at least 9 times. Pyrim-MOF-Co was also significantly more robust and active than its homogeneous control, highlighting the beneficial effect of active-site isolation within the MOF framework that prevents intermol. decomposition The exptl. and computational studies suggested (pyrim^â€?)Co^I(THF) as the active catalytic species within the MOF, which undergoes a mechanistic pathway of oxidative addition, turnover limiting σ-bond metathesis, followed by reductive elimination to afford the boronate ester. The pyridylimine-functionalized metal-organic framework (pyrim-MOF)-based single-site cobalt-catalyst is efficient for chemoselective borylation of arene and benzylic C-H bonds. The heterogeneous MOF-catalyst is significantly more robust and active than its homogeneous control, highlighting the beneficial effect of active-site isolation within the MOF framework that prevents intermol. decomposition

Inorganic Chemistry published new progress about 919119-59-8. 919119-59-8 belongs to indole-building-block, auxiliary class Indole,Boronic acid and ester,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-Methyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole, and the molecular formula is C15H20BNO2, Quality Control of 919119-59-8.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Newar, Rajashree published the artcileMono-Phosphine Metal-Organic Framework-Supported Cobalt Catalyst for Efficient Borylation Reactions, Recommanded Product: 2-Methyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole, the publication is European Journal of Inorganic Chemistry (2022), 2022(10), e202101019, database is CAplus.

The authors report a metal-organic framework (MOF) supported monoligated phosphine-Co complex, which is an active heterogeneous catalyst for aromatic C-H borylation and alkene hydroboration. The mono(phosphine)-Co catalyst (MOF-P-Co) was prepared by metalation of a porous triarylphosphine-functionalized MOF (MOF-P) with CoCl₂ followed by activation with NaEt₃BH. The MOF catalyst has a broad substrate scope with excellent functional group tolerance to afford arene- and alkyl-boronate esters in excellent yields and selectivity. MOF-P-Co gave a turnover number (TON) of 30,000 and could be recycled and reused at least 13 times in arene C-H borylation. Importantly, the attempt to prepare the homogeneous control (Ph₃P-Co) using PPh₃ was unsuccessful due to the facile disproportionation reactions or intermol. ligand exchanges in the solution In contrast, the site isolation of the active mono(phosphine)-Co species within the MOF affords the robust and coordinatively unsaturated metal complexes, allowing to explore their catalytic properties and the reaction mechanism.

European Journal of Inorganic Chemistry published new progress about 919119-59-8. 919119-59-8 belongs to indole-building-block, auxiliary class Indole,Boronic acid and ester,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-Methyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole, and the molecular formula is C15H20BNO2, Recommanded Product: 2-Methyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Jacquemard, Ulrich published the artcileMild and selective deprotection of carbamates with Bu₄NF, Application of tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate, the publication is Tetrahedron (2004), 60(44), 10039-10047, database is CAplus.

A mild method allowing the deprotection of carbamates using TBAF in THF is reported. Reaction was performed on indole, indoline, N-Me aniline, aniline, and tryptamine derivatives The observed selectivity according to the carbamates or the substrates is discussed. A mechanism is also postulated.

Tetrahedron published new progress about 167015-84-1. 167015-84-1 belongs to indole-building-block, auxiliary class Indols, name is tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate, and the molecular formula is C15H20N2O2, Application of tert-Butyl 3-(2-aminoethyl)-1H-indole-1-carboxylate.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Abdelbaset, Mahmoud S. published the artcileDiscovery of novel thienoquinoline-2-carboxamide chalcone derivatives as antiproliferative EGFR tyrosine kinase inhibitors, Name: 2-(5-Fluoro-2-hydroxyphenyl)-2-(1-oxoisoindolin-2-yl)-N-(thiazol-2-yl)acetamide, the publication is Bioorganic & Medicinal Chemistry (2019), 27(6), 1076-1086, database is CAplus and MEDLINE.

Novel thienoquinoline carboxamide-chalcone derivatives were prepared via the cyclization of acylated chalcones and 2-mercaptoquinoline-3-carbaldehyde in DMF with K₂CO₃. Thienoquinolines 9a-f, h exhibited promising antiproliferative effect against all the tested cell lines and gave a significant activity as EGFR inhibitors, with IC₅₀ values ranging from 0.5 and 3.2 μM, and compounds 9e and 9f being the most active of the series. They also showed better activity than Erlotinib against melanoma cancer cell line A375. Moreover, compound 9f influenced pre G1 apoptosis and cell cycle arrest at G2/M phase. The binding mode of the best EGFR inhibitor 9e in the EGFR active site revealed that the thienoquinoline ring occupied the ATP-binding site while the chalcone moiety is located in the allosteric site and is responsible for the enhanced activity of these compounds

Bioorganic & Medicinal Chemistry published new progress about 1942114-09-1. 1942114-09-1 belongs to indole-building-block, auxiliary class Indoline,Thiazole,Fluoride,Amine,Benzene,Amide,Alcohol,Protein Tyrosine Kinase/RTK, name is 2-(5-Fluoro-2-hydroxyphenyl)-2-(1-oxoisoindolin-2-yl)-N-(thiazol-2-yl)acetamide, and the molecular formula is C19H14FN3O3S, Name: 2-(5-Fluoro-2-hydroxyphenyl)-2-(1-oxoisoindolin-2-yl)-N-(thiazol-2-yl)acetamide.

Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles