Radical Beckmann Rearrangement and Its Application in the Formal Total Synthesis of Antimalarial Natural Product Isocryptolepine via C–H Activation
作者:Pankaj S. Mahajan、Vivek T. Humne、Subhash D. Tanpure、Santosh B. Mhaske
DOI:10.1021/acs.orglett.6b01634
日期:2016.7.15
ketoximes, mediated by ammonium persulfate-dimethyl sulfoxide as a reagent, has been achieved under neutral conditions. Based on the radical trapping and 18O-labeling experiments, the transformation follows a mechanism involving a radical pathway. The scope and generality of the developed protocol has been demonstrated by 19 examples. The developed protocol and Pd-catalyzed intramolecular double C–H
The Schmidtreaction, the treatment with hydroazoic acid in the presence of a strong acid, converts ketones to amides directly and has been broadly applied in organic synthesis. In this communication, the Schmidtreaction of ketones was carried out in DME solution in a continuous-flow microreactor and gave the amide products. The enclosed small-volume feature of the microreactor made this reaction safe
A microwave-assisted N-fluorobenzenesulfonimide (NFSI)/Lewis acid-catalyzed Beckmannrearrangement was developed. The remarkable promotion to the electrophilicity of NFSI by Lewis acids was illustrated utilizing a series of readily available oxime substrates. The action model between NFSI and Lewis acids was probed by control experiments and theoretical calculations.
Use of 4' of 5'-hydroxy and 4'- or 5'-alkoxy-substituted electron transfer agents in compositions, elements, test kits and analytical methods
申请人:Johnson & Johnson Clinical Diagnostics, Inc.
公开号:EP0603953A1
公开(公告)日:1994-06-29
Aqueous compositions, test kits, test devices and methods can be used to detect hydrogen peroxide or peroxidase by generating a colorimetric or chemiluminescent signal in the presence of the analyte. Signal generation is enhanced by the presence of certain substituted 4-hydroxy- or 4-alkoxy-substituted phenyl or naphthyl electron transfer agents.
Analytical element and immunoassay using a 4-hydroxy or 4-alkoxyarylacetamide as stabilizer
申请人:Johnson & Johnson Clinical Diagnostics, Inc.
公开号:EP0603954A2
公开(公告)日:1994-06-29
A dry analytical element can be used to sensitively and rapidly detect a wide variety of specific binding ligands in either a competitive binding or sandwich assay format. The assays are carried out using a peroxidase-labeled immunoreactant. The peroxidase label is stabilized with a 4-hydroxy or 4-alkoxyarylacetamide which is located in one or more zones of the element. Not only is the label stabilized with the stabilizer, but the assay is more sensitive.