The Rh4(CO)12-catalyzed hydroformylation at low temperature (40°C) of the 1-, 2- and 3-vinylpyrrole gives the corresponding branched aldehydes 2-(1-pyrrolyl)propanal, 2-(2-pyrollyl)propanal and 2-(3-pyrrolyl)propanal with high α-regioselectivity.
The present invention relates to inhibitors of the enzyme TRMT2A and medical uses thereof. More particularly, the present invention relates to the treatment and the prevention of polyglutamine diseases using TRMT2A inhibitors.
The influence of the temperature on the regioselectivity in the hydroformylation of the vinylpyrrole isomers and of the corresponding N-tosylated substrates has been investigated in the range 20-100 degrees C, in the presence of Rh-4(CO)(12). Ar all the temperatures the branched aldehyde was prevailing with respect to the linear isomer for all the substrates (I cu-regioselectivity). With increasing temperature, an increase of the linear aldehyde was observed to a different extent in dependence on the substrate nature. H-2 NMR investigation of the crude reaction mixture recovered from deuterioformylation of 3-vinylpyrrole at partial substrate conversion points out that the observed depression of the alpha-regioselectivity with increasing temperature must be connected to a beta-hydride elimination process occurring for the branched alkyl-rhodium intermediates but not for the linear ones. (C) 1997 Elsevier Science S.A.
[EN] TRMT2A INHIBITORS FOR USE IN THE TREATMENT OF POLYGLUTAMINE DISEASES<br/>[FR] INHIBITEURS DE TRMT2A UTILISÉS POUR LE TRAITEMENT DE MALADIES À POLYGLUTAMINE
申请人:FORSCHUNGSZENTRUM JUELICH GMBH FACHBEREICH PATENTE R P
公开号:WO2020109233A2
公开(公告)日:2020-06-04
The present invention relates to inhibitors of the enzyme TRMT2A and medical uses thereof. More particularly, the present invention relates to the treatment and the prevention of polyglutamine diseases using TRMT2A inhibitors.
Intramolecular radical acylation of 2-methylsulfonylpyrroles
作者:Luis D. Miranda、Raymundo Cruz-Almanza、Abraham Alvarez-Garcı́a、Joseph M. Muchowski
DOI:10.1016/s0040-4039(00)00342-7
日期:2000.4
Primary alkyl radicals generated (AIBN/Bu3SnH) from 1-(2- or 3-haloalkyl)-2-methylsulfonylpyrroles are intercepted by CO (80 atm), and the acyl radicals so produced undergo intramolecular oxidative cyclization at the α-position, giving bicyclic ketones with retention or loss of the sulfonyl moiety.
由1-(2-或3-卤代烷基)-2-甲基磺酰吡咯生成的伯烷基自由基(AIBN / Bu 3 SnH)被CO(80 atm)截获,因此生成的酰基在α位进行分子内氧化环化,得到具有保留或丢失磺酰基部分的双环酮。