Silica–ferric chloride (SiO2–FeCl3) catalyzed selective synthesis of 2-substituted benzimidazole through <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>C</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>sp</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:msub><mml:mtext /><mml:msub><mml:mrow><mml:mtext>C</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>sp</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:msub></mml:mrow></mml:math> bond cleavage of β-ketoester/amide
作者:Swapan Majumdar、Ankita Chakraborty、Subrata Bhattacharjee、Sudipto Debnath、Dilip K. Maiti
DOI:10.1016/j.tetlet.2016.08.099
日期:2016.10
Silica–ferric chloride (SiO2–FeCl3) supported reagent was successfully utilized as recyclable catalyst for the general and highly efficient synthesis of 2-substitutedbenzimidazole by the condensation of 1,2-diamino benzene and β-ketoester/amide followed by original Csp2Csp3 bond cleavage. Evidences in favor of CC (α–β) bond cleavage of β-ketoesters/amides are established.
Solvent-free domino acylation/cyclization reactions between fatty acid esters and o-phenylenediamine mediated by immobilized lipase from Mucor miehei (MML) were found to be an efficient way in the synthesis of 2-alkylbenzimidazole. Compared with other substrates, methyl fatty acid esters with moderated chain length exhibited best activity with yield up to 95%. The mechanism of the domino process was
First simple and mild synthesis of 2-alkylbenzimidazoles involving a supported enzymatic catalyst
作者:Gilbert Renard、Dan A. Lerner
DOI:10.1039/b707763g
日期:——
A new enzymatic synthesis is described for 2-alkyl-benzimidazoles a technologically important class of compounds. It is a one-step synthesis which involves a supported enzyme (Lipozyme®) and is carried out in very mild conditions in hydrocarbon solvents to give 2-alkyl-benzimidazoles in good yields, starting from the free acids. Preliminary results indicate that the reaction has a potential to produce new molecules using sensitive or conjugated acids.
[EN] HETEREOCYCLIC AGENT AS CATALYTIC STABILIZING AGENT IN A HYDROFORMYLATION PROCESS<br/>[FR] AGENT HÉTÉROCYCLIQUE COMME AGENT DE STABILISATION CATALYTIQUE DANS UN PROCÉDÉ D'HYDROFORMYLATION
申请人:DOW TECHNOLOGY INVESTMENTS LLC
公开号:WO2014149915A1
公开(公告)日:2014-09-25
A heterocyclic nitrogen stabilizing agent is employed to reduce the rate of catalyst deactivation in a hydroformylation process.
在氢甲酰化过程中,使用杂环氮稳定剂来降低催化剂失活的速率。
Benzimidazole derivatives endowed with potent antileishmanial activity
Two sets of benzimidazole derivatives were synthesised and tested in vitro for activity against promastigotes of Leishmania tropica and L. infantum. Most of the tested compounds resulted active against both Leishmania species, with IC50 values in the low micromolar/sub-micromolar range. Among the set of 2-(long chain)alkyl benzimidazoles, whose heterocyclic head was quaternised, compound 8 resulted