Metastable ion study of organosilicon compounds part II—hexamethyldisiloxane
摘要:
AbstractUnimolecular reactions of the metastable silicenium ion (CH3)3SiOSi(CH3)2+ generated by dissociative ionization of bexamethyldisiloxane were investigated by mass‐analysed ion kinetic energy (PUKE) Spectrometry. The characteristic fragmentations observed were losses of CH4 and (CH3)2SiO molecules. Complete scrambling of all methyl groups prior to these reactions was found by investigating the MIKE spectra of deuterium labelled analogues (CD3)3SiOSi(CH3)2+ and (CH3)3SiOSi(CD3)3+. The loss of methane was accompanied by a large kinetic energy release (T0.5 = 482 meV). The MIKE spectra of silicenium ions were compared with those of their carbon analogues. The most predominant reaction of metastable (CH3)3COC(CH3)3+ ion was the loss of CH2C(C H3)2 leading to protonated acetone. Significant differences between the ion fragmention characteristics of silicon and carbon compounds were found.
Proton Acid-Catalysed Transformations of Estrogen Derivatives: New Results and Some Mechanistic Aspects of theKober Colour Reaction
作者:Ulf Pindur、Thomas Schall
DOI:10.1002/ardp.19943271007
日期:——
3‐O‐methylated estrogenderivatives 1a‐d and α‐estradiol (1e) underwent sulfuric acid‐catalysed transformations to furnish the steroids 2–6. The processes involved in the reaction sequence are regioselective sulfonation and, above all, the Wagner‐Meerwein rearrangement of the methyl group at C‐13. With the objective of obtaining further information on the course of the Kober colour reaction of estrogens, some
The present invention relates to compounds that modulate nicotinic receptors as non-competitive antagonists, methods for their synthesis, methods for use, and their pharmaceutical compositions.
[EN] SMALL MOLECULE INHIBITORS OF NF-kB INDUCING KINASE<br/>[FR] INHIBITEURS À PETITE MOLÉCULE DE KINASE INDUISANT NF-KB
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2020239999A1
公开(公告)日:2020-12-03
The present invention relates to compounds that inhibit NIK and pharmaceutical compositions comprising such compounds and methods of using the same. These compounds and pharmaceutical compositions are envisaged to be useful for preventing or treating diseases such as cancer (such as B-cell malignancies including leukemias, lymphomas and myeloma), inflammatory disorders, autoimmune disorders, immunodermatologic disorders such as palmoplantar pustulosis and hidradenitis suppurativa, and metabolic disorders such as obesity and diabetes.
generation of amines by palladium-catalyzed nucleophilic benzylic addition of 2-methyl-substituted azaarenes to N-sulfonyl aldimines under neutral conditions via C-H bondactivation has been developed. This reaction represents a very efficient methodology for the synthesis of heterocycle-containing amines and thus opens a new way to access amines through C-H bondactivation.
Iron-Catalyzed Direct Alkenylation of 2-Substituted Azaarenes with <i>N</i>-Sulfonyl Aldimines via C–H Bond Activation
作者:Bo Qian、Pan Xie、Yinjun Xie、Hanmin Huang
DOI:10.1021/ol200684b
日期:2011.5.20
A novel iron-catalyzed alkenylation of 2-substituted azaarenes through sp3 C–Hbondactivation has been developed. A favorable E2-elimination is proposed as a key step to cleavage of C–H and C–N bonds for the construction of a C═C bond in high stereoselectivity. This transformation represents an efficient way to synthesize 2-alkenylated azaarenes from simple starting materials.