Enantioselective TADMAP-Catalyzed Carboxyl Migration Reactions for the Synthesis of Stereogenic Quaternary Carbon
作者:Scott A. Shaw、Pedro Aleman、Justin Christy、Jeff W. Kampf、Porino Va、Edwin Vedejs
DOI:10.1021/ja056150x
日期:2006.1.1
efficient and are used to prepare chiral lactams (23) and lactones (30) containing a quaternary asymmetric carbon. TADMAP-catalyzed carboxyl migrations in the indole series are relatively slow and proceed with inconsistent enantioselectivity. Modeling studies (B3LYP/6-31G*) have been used in qualitative correlations of catalyst conformation, reactivity, and enantioselectivity.
Heterocyclic derivatives as modulators of ion channels
申请人:Martinborough Esther
公开号:US20080027067A1
公开(公告)日:2008-01-31
The present invention relates to heterocyclic derivatives useful as inhibitors of ion channels. The invention also provides pharmaceutically acceptable compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various disorders.
The present invention provides compounds of formula I where R
1
to R
4
are as defined herein which are useful for treating or preventing an human immunodeficiency virus (HIV) infection, or treating AIDS or ARC. The invention further provides for methods of treating or preventing HIV infection with compounds according to formula I and compositions containing the same. The invention still further provides process for the preparation of compounds of formula I wherein R
4
is A
1
and X
1
is NH or O.
[EN] SUBSTITUTED ACIDS FOR THE TREATMENT OF RESPIRATORY DISEASES<br/>[FR] ACIDES SUBSTITUES POUR LE TRAITEMENT DE MALADIES RESPIRATOIRES
申请人:ASTRAZENECA AB
公开号:WO2006005909A1
公开(公告)日:2006-01-19
The invention relates to substituted acids of formula (I), where T,W,X,Y,Z,R1 and R2 as defined in the claims, as useful pharmaceutical compounds for treating asthma and rhinitis, pharmaceutical compositions containing them, and a processes for their preparation.
Metal-Free Decarboxylative Hetero-Diels–Alder Synthesis of 3-Hydroxypyridines: A Rapid Access to <i>N</i>-Fused Bicyclic Hydroxypiperidine Scaffolds
作者:Laurie-Anne Jouanno、Vincent Di Mascio、Vincent Tognetti、Laurent Joubert、Cyrille Sabot、Pierre-Yves Renard
DOI:10.1021/jo402729a
日期:2014.2.7
A complete experimental and theoreticalstudy of the thermally controlled metal-free decarboxylative hetero-Diels–Alder (HDA) reaction of 5-alkoxyoxazoles with acrylic acid is reported. This strategy offers a new entry to valuable 2,6-difunctionalized 3-hydroxypyridines from readily available 2- and 4-disubstituted 5-alkoxyoxazoles. The reaction conditions proved compatible with, among others, ketone