The pinacol of ligands: The (R)‐DTBM‐Segphos coordinated copper(I) complex was found to be very effective for the asymmetrichydroboration of β‐substituted styrene derivatives with pinacolborane (see scheme; DTBM=3,5‐di‐tert‐butyl‐4‐methoxyphenyl). This new method affords benzylic pinacol boronate esters with excellent levels of regio‐ and enantioselectivity (>99 %).
Enantioselective Radical Addition/Cross‐Coupling of Organozinc Reagents, Alkyl Iodides, and Alkenyl Boron Reagents
作者:Matteo Chierchia、Peilin Xu、Gabriel J. Lovinger、James P. Morken
DOI:10.1002/anie.201908029
日期:2019.10
A hybrid transition-metal/radical process is described that results in the addition of organozinc reagents and alkyl halides across alkenyl boron reagents in an enantioselective catalytic fashion. The reaction can be accomplished both intermolecularly and intramolecularly, providing useful product yields and high enantioselectivities in both manifolds.
The present invention relates to novel fatty acid derivatives, methods for their preparation, pharmaceutical compositions including such compounds, and methods of using these compounds and compositions, especially as agents for the treatment of obesity and related disorders, and for improving cognition.
Set of Geldanamycin Derivatives and Their Preparation Methods
申请人:Li Zhuorong
公开号:US20100311694A1
公开(公告)日:2010-12-09
A set of geldanamycin derivatives and their preparation methods. Pharmaceutical compositions comprising the said compounds as an active ingredient which are used as antivirus and antitumor agents. The said derivatives are used in the manufacture of heat shock protein 90 (Hsp 90) inhibiting agents which have the utility as antivirus and antitumor agents.
Disclosed are compounds of formula (I):
wherein R1 and R2 are defined herein, which are useful as inhibitors of the kinase activity of the IκB kinase (IKK) complex. The compounds are therefore useful in the treatment of IKK mediated diseases including autoimmune diseases inflammatory diseases and cancer. Also disclosed are pharmaceutical compositions comprising these compounds and processes for preparing these compounds.