Highly selective trapping of unsymmetrical pentadienyl anions by silicon and tin electrophiles. Marked contrast between kinetic and thermodynamic control of product composition
摘要:
The nucleophilic reaction of lithium and potassium salts of five pentadienyl anions bearing sterically and/or coordinatively different groups at their unsymmetrical 2-position toward Me3SiCl and Me3SnBr is described. When the anion of the potassium salt was trapped by Me3SiCl, (Z)-4-substituted-pentadienylsilanes were obtained with high selectivity (87-100%). The lithium salt, however, gave a mixture of (E)- and (Z)-4-substituted-pentadienylsilanes. The coupling reaction proceeds under kinetic control, because the product composition from Si trapping reflected the structure of the parent dienyl anion and the steric interaction between the incoming Me3Si group and the substituent on the anion. In contrast, when the anion was trapped by Me3SnBr under the identical conditions, (Z)-2-substituted-pentadienyltins were formed with 60-96% selectivity. Only relatively small changes in product composition, as a function of the cation or the substituent on the anion, were observed. These results could be explained by thermodynamic controlling factors, including a 1,5-Me3Sn shift, and a redistribution of pentadienyl groups under basic conditions.
[EN] COMPOUNDS FOR TREATING RESPIRATORY SYNCYTIAL VIRUS INFECTIONS<br/>[FR] COMPOSÉS POUR LE TRAITEMENT DES INFECTIONS PAR LE VIRUS RESPIRATOIRE SYNCYTIAL
申请人:BIOTA SCIENT MANAGEMENT
公开号:WO2011094823A1
公开(公告)日:2011-08-11
The present invention relates to compounds of formula (I), its salts, isomers or prodrugs thereof useful in the treatment of viral infections, in particular respiratory syncytial virus (RSV) infections. The present invention also relates to processes for preparing the compounds and intermediates used in their preparation.
A highly diastereoselective synthesis of trans-2-substituted cyclopentylamines via a tandem hydrozirconation/Lewis acid-mediated cyclization sequence applied to butenyl oxazolidines is described. The method allows an easy preparation of diversely substituted cyclopentylamines which appear to be useful synthetic intermediates. This was further illustrated by the syntheses of (±)-Rodocaine, (±)-trans-pentacin
[EN] BENZYLPYRROLIDINONE DERIVATIVES AS MODULATORS OF CHEMOKINE RECEPTOR ACTIVITY<br/>[FR] DÉRIVÉS DE BENZYLPYRROLIDINONE UTILES COMME MODULATEURS DE L'ACTIVITÉ DES RÉCEPTEURS DES CHIMIOKINES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2011100227A1
公开(公告)日:2011-08-18
The present application describes modulators of MCP-1 or CCR-2 of formula (I) or stereoisomers or prodrugs or pharmaceutically acceptable salts thereof, wherein m, n, W, X, R1 and R6, are defined herein. In addition, methods of treating and preventing inflammatory diseases such as asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and transplant rejection using modulators of formula (I) are disclosed.
BENZYLPYRROLIDINONE DERIVATIVES AS MODULATORS OF CHEMOKINE RECEPTOR ACTIVITY
申请人:Mangion Ian K.
公开号:US20120295899A1
公开(公告)日:2012-11-22
The present application describes modulators of MCP-1 or CCR-2 of formula
or stereoisomers or prodrugs or pharmaceutically acceptable salts thereof, wherein m, n, W, X, R
1
and R
6
, are defined herein. In addition, methods of treating and preventing inflammatory diseases such as asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and transplant rejection using modulators of formula (I) are disclosed.