Bis-trimethylsilylacetamide: A reagent for the control of Friedel-Crafts alkylation reactions using methyl chloromethoxyacetate
摘要:
The Friedel-Crafts alkylation reactions of electron rich aromatic compounds using methyl alpha-chloro-alpha-methoxyacetate and Lewis acids leads predominantly to the formation of diarylacetic acid derivatives in which the second stage of the sequence is favoured by the presence of hydrogen chloride generated in the first step; effective control can be achieved in a number of cases by the addition of bis-trimethylsilylacetamide.
Benzannelated derivatives, their manufacture and use as pharmaceutical agents
申请人:Ackermann Jean
公开号:US20050096336A1
公开(公告)日:2005-05-05
There are presented compounds of the formula
wherein R
6
and R
7
is
R
4
and R
5
or R
5
and R
6
together with the carbon atoms to which they are attached, form a ring as defined in the description and X
1
, X
2
, Y
1
to Y
4
, R
1
to R
13
and n are as specified in the description, and to all enantiomers and pharmaceutically acceptable salts and/or esters thereof. The invention further relates to pharmaceutical compositions containing such compounds, to a process for their preparation and to their use for the treatment and/or prevention of diseases which are modulated by PPARδ and/or PPARα agonists.
Novel 7-azido-3-cephem compounds are prepared via .alpha.-amino-phosphonoacetate esters. The cephem compounds are intermediates for the preparation of novel and known useful antibiotic cephalosporins.
Process for the production of chiral propionic acid derivatives
申请人:Puentener Kurt
公开号:US20050070714A1
公开(公告)日:2005-03-31
The present invention is concerned with a novel process for the preparation of compounds of formula I
comprising catalytic asymmetric hydrogenation of a compound of formula (II)
in the presence of a catalyst comprising ruthenium and a chiral diphosphine ligand or comprising rhodium and a chiral diphosphine ligand, wherein R
1
, R
2
, R
3
and R
4
are as defined in the specification and claims. The compounds of formula I and the corresponding salts and/or esters are pharmaceutically active substances.
NOVEL BIAROMATIC COMPOUNDS THAT MODULATE PPAR-RECEPTORS
申请人:Boiteau Jean-Guy
公开号:US20090012129A1
公开(公告)日:2009-01-08
Novel biaromatic compounds that modulate peroxisome proliferator-activator receptors, known as PPAR, having the formula (I):
are formulated into pharmaceutical compositions useful in human or veterinary medicine, or alternatively, in cosmetic compositions.
Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof, (I) wherein R1, X1, X2, W1, A, W2, R3, W3 and R4 are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention.