A new synthesis of carmethizole and related nitrogen analogues
摘要:
A new efficient six-step synthesis of carmethizole, a novel bis-carbamate alkylating agent, and syntheses of related nitrogen analogues are described, using a key 4,5-disubstituted imidazole intermediate 8. (C) 1997 Elsevier Science Ltd.
Design, Synthesis and Evaluation of Imidazolylmethyl Carbamate Prodrugs of Alkylating Agents
摘要:
Two approaches to prodrugs of alkylating agents based on an imidazolylmethyl carbamate nucleus were explored. A 2-azido analogue (3) of the bis-carbamate carmethizole (1) displayed similar aerobic cytotoxicity to 1 in a panel of human and murine cell lines. Approaches to the 2-amino and 2-carbamoyl analogues are described. In the second approach an imidazolylmethanol was used as a 'trigger' linked via a carbamate to the alkylating agent N,N-bis(2-chlorethyl)amine (BCEA). Nitroimidazole and methylsulphinylimidazole carbamate prodrugs 6-8 were 5-20-fold less toxic than BCEA. Despite this deactivation in the prodrug form, little increase in cytotoxicity was observed under hypoxia. The data suggest that BCEA released on bioreduction is not sufficiently potent to contribute significant additional cytotoxicity. (C) 2000 Elsevier Science Ltd. All rights reserved.
COMPOUND OR ITS TAUTOMER, METAL COMPLEX COMPOUND, COLORED PHOTOSENSITIVE CURING COMPOSITION, COLOR FILTER, AND PRODUCTION
申请人:MIZUKAWA Yuki
公开号:US20120238752A1
公开(公告)日:2012-09-20
Provided is a colored photosensitive curing composition useful for color filters in primary colors, including blue, green, and red, having a high molar absorption coefficient and allowing a reduction in film thickness and superior color purity and fastness.
A colored photosensitive curing composition, comprising, as its colorant, a dipyrromethene-based metal complex compound obtained from a metal or metal compound and a dipyrromethene-based compound represented by the following Formula (I):
wherein in Formula (I), R
1
to R
6
each independently represent a hydrogen atom or a substituent group; and R
7
represents a hydrogen or halogen atom, or an alkyl, aryl or heterocyclic group.
[EN] AZOLE-FUSED PYRIDAZIN-3(2H)-ONE DERIVATIVES<br/>[FR] DÉRIVÉS DE PYRIDAZIN-3(2H)-ONE FUSIONNÉS PAR UN AZOLE
申请人:TAKEDA PHARMACEUTICALS CO
公开号:WO2021055326A1
公开(公告)日:2021-03-25
Disclosed are compounds of Formula (1) and pharmaceutically acceptable salts thereof, wherein α, β, n, R4, R5, R6, R8, R9, R10, R11, X1, X2, X3 and X7 are defined in the specification. This disclosure also relates to materials and methods for preparing compounds of Formula (1), to pharmaceutical compositions comprising them, and to their use for treating diseases, disorders, and conditions associated with GPR139.
Derivatives of the cationic tropylium annulated imidazolylidene ITrop+ are obtained by hydride abstraction from related cycloheptatriene compounds. Spectroscopic, structural and theoretical data indicate that, as a cationic relative of benzimidazolylidenes, ITrop+ has highly reduced σ-donor and strong π-acceptor character.
A Direct Cycloaminative Approach to Imidazole Derivatives via Dual C–H Functionalization
作者:Sagar Arepally、Venkata Nagarjuna Babu、Manickam Bakthadoss、Duddu S. Sharada
DOI:10.1021/acs.orglett.7b01840
日期:2017.10.6
ed C(sp3)–H azidation was a keystep for the cycloaminative process. An unprecedented method for metal-free dehydrogenative N-incorporation into C(sp3)–H and C(sp2)–H bonds for the synthesis of diverse imidazoles has been disclosed. The overall transformation involves the construction of four C–N bonds through hydroamination-azidation-cyclization sequence. The reaction can be easily handled and proceeds
Ring Carbon Functionalization of<i>N</i>-Heterocyclic Carbene Ligand with Ester Groups. Electronic Effect of Ester Groups on Coordination Properties
作者:Kenji Hara、Yoshikazu Kanamori、Masaya Sawamura
DOI:10.1246/bcsj.79.1781
日期:2006.11
Palladium complexes with an imidazol-2-ylidene ligand functionalized with ester groups at its 4,5-positions were synthesized from a readily available imidazole derivative. σ-Donation from the carbene ligand to the palladium atom is considerably weakened by functionalization with the two ester moieties.