An imino Diels–Alder reaction of 2-siloxydienes with aldimines catalyzed by triflic imide (Tf2NH; 0.1∼10 mol % amount) has been developed leading to substituted piperidin-4-ones. Tf2NH catalyst is compatible with basic functions, such as pyridine and indole rings in the imino Diels–Alder reaction. Furthermore, X-ray crystallographic analysis indicates that trans-2,6-diphenyl-4-piperidinone 4a obtained
A carbonaceous material is derived from a polysaccharide by carbonisation. The polysaccharide is preferably a starch. The carbonaceous material has mesoporosity and is useful as a solid catalytic support.
一种含碳材料通过炭化从多糖中得到。多糖最好是淀粉。该含碳材料具有介孔性,并且可用作固体催化支撑剂。
Unexpected and easy annulation of Fischer-type phenylethenyl carbene complexes
作者:Jos� Barluenga、Fernando Aznar、Sof�a Barluenga
DOI:10.1039/c39950001973
日期:——
The reaction between 2-aminobuta-1,3-dienes and Fischer-type phenylacetylenic carbene complexes leads under very mild conditions to highly functionalized dihydrofluorene derivatives in almost quantitative yields via annulation of a phenylethenyl carbene intermediate.
Probe compound for detecting and isolating enzymes and means and methods using the same
申请人:Helmholtz-Zentrum für Infektionsforschung GmbH
公开号:EP2230312A1
公开(公告)日:2010-09-22
The present invention relates to a probe compound that can comprise any substrate or metabolite of an enzymatic reaction in addition to an indicator component, such as, for example, a fluorescence dye, or the like. Moreover, the present invention relates to means for detecting enzymes in form of an array, which comprises any number of probe compounds of the invention which each comprise a different metabolite of interconnected metabolites representing the central pathways in all forms of life. Moreover, the present invention relates to a method for detecting enzymes involving the application of cell extracts or the like to the array of the invention which leads to reproducible enzymatic reactions with the substrates. These specific enzymatic reactions trigger the indicator (e.g. a fluorescence signal) and bind the enzymes to the respective cognate substrates. Moreover, the invention relates to means for isolating enzymes in form of nanoparticles coated with the probe compound of the invention. The immobilisation of the cognate substrates or metabolites on the surface of nanoparticles by means of the probe compounds allows capturing and isolating the respective enzyme, e.g. for subsequent sequencing.
Reactions of 2‐Amino‐1,3‐butadienes and Fischer Alkynyl Carbenes: Up to Nine C−C Bonds and Seven Stereogenic Centers Created in a Stereoselective Manner through a Cascade Process