Studies on the structure–enantioselectivity relationships in the catalytic asymmetric intramolecular cyclopropanation reaction of α-diazo-β-keto sulfones possessing a methyl-substituted phenyl group
摘要:
This manuscript describes studies on structure-enantioselectivity relationships in the catalytic asymmetric intramolecular cyclopropanation (IMCP) reaction of alpha-diazo-beta-keto sulfones possessing a methyl-substituted phenyl group. Enantioselectivity of the IMCP reaction of the alpha-diazo-beta-keto sulfones was varied by the position of a methyl group on the pheny] group in the substrate, and the 2,3-dimethylphenyl sulfone 11h provided the product 12h in 95% yield with 93% ee. This yield is superior to that of the substrate with a mesityl sulfone 11b, and the product 12h is useful because alkylation of its cyclopropane-opened P-keto sulfone derivative 15h provides the C-alkylated product as a major product. (c) 2006 Elsevier Ltd. All rights reserved.
[EN] ISOINDOLINE COMPOSITIONS AND METHODS FOR TREATING NEURODEGENERATIVE DISEASE [FR] COMPOSITIONS ISOINDOLINE ET MÉTHODES DE TRAITEMENT D'UNE MALADIE NEURODÉGÉNÉRATIVE
Polystyrene Supported Al(OTf)<sub>3</sub>: a Stable, Efficient, Selective, and Reusable Catalyst for Sulfonylation of Arenes with Sulfonic Acids
作者:Kaveh Parvanak Boroujeni
DOI:10.5012/bkcs.2010.31.7.1887
日期:2010.7.20
supported aluminium triflate (Ps-Al(OTf)3) was found to be an efficient and chemoselective heterogeneous Lewis acid catalyst for the direct conversion of arenes to sulfones using sulfonic acids as sulfonylating agents. The solid acid catalyst is stable (as a bench top catalyst) and can be easily recovered and reused without appreciable change in its efficiency.
Total Synergistic Effect between Triflic Acid and Bismuth(<scp>III</scp>) or Antimony(<scp>III</scp>) Chlorides in Catalysis of the Methanesulfonylation of Arenes
作者:Magali Peyronneau、Marie-Thérèse Boisdon、Nicolas Roques、Stéphane Mazières、Christophe Le Roux
Study of regioselective methanesulfonylation of simple aromatics with methanesulfonic anhydride in the presence of zeolite catalysts
作者:Keith Smith、Gordon M. Ewart、Gamal A. El-Hiti、Kenneth R. Randles
DOI:10.1039/b409922b
日期:——
Regioselective methanesulfonylation of simple aromatics using methanesulfonic anhydride can be achieved over zeolite catalysts. For example, methanesulfonylation of toluene over various cation-exchanged zeolite β catalysts affords higher para-selectivity in the synthesis of methyl tolyl sulfone than standard Friedel–Crafts methanesulfonylation utilising aluminium chloride.
Isoindoline compositions and methods for treating neurodegenerative disease
申请人:COGNITION THERAPEUTICS, INC.
公开号:US10611728B2
公开(公告)日:2020-04-07
Isoindoline sigma-2 receptor antagonist compounds, pharmaceutical compositions comprising such compounds, and methods for inhibiting Abeta-associated synapse loss or synaptic dysfunction in neuronal cells, modulating an Abeta-associated membrane trafficking change in neuronal cells, and treating cognitive decline associated with Abeta pathology are provided.