Intramolecular [4+3] Cycloadditions. Studies of Relative Asymmetric Induction
摘要:
Treatment df both the E and Z isomers of alkoxyallylic sulfones 20a and 20b with TiCl4 results in the formation of 4 + 3 cycloadducts by intramolecular cycloaddition. The distribution of diastereomers is different from each isomer of educt. This suggests that cycloaddition occurs faster than any isomerization process of the intermediate allylic cations. Both the E and Z isomers of 20c lead to the same 4 + 3 cycloadduct with essentially complete diastereoselectivity. Inherently high simple diastereoselection and a strong conformational bias in the allylic cation intermediates for both isomers account for this selectivity. The importance of allylic cation stereochemistry in these reactions is underscored by the cyclization of 20d. The Z isomer give only 4 + 3 cycloadducts with excellent relative but poor simple diastereoselection, suggestive of a concerted reaction. The E isomer give a [3 + 2] cycloadduct, enol ether 60, as the major cycloadduct as well as 4 + 3 cycloadducts and chloride-trapping product 61. This result is indicative of a stepwise reaction. The data reflect the importance of allylic cation stereochemistry in the regiochemical and stereochemical outcomes of intramolecular 4 + 3 cycloaddition reactions.
Intramolecular [4+3] Cycloadditions. Studies of Relative Asymmetric Induction
摘要:
Treatment df both the E and Z isomers of alkoxyallylic sulfones 20a and 20b with TiCl4 results in the formation of 4 + 3 cycloadducts by intramolecular cycloaddition. The distribution of diastereomers is different from each isomer of educt. This suggests that cycloaddition occurs faster than any isomerization process of the intermediate allylic cations. Both the E and Z isomers of 20c lead to the same 4 + 3 cycloadduct with essentially complete diastereoselectivity. Inherently high simple diastereoselection and a strong conformational bias in the allylic cation intermediates for both isomers account for this selectivity. The importance of allylic cation stereochemistry in these reactions is underscored by the cyclization of 20d. The Z isomer give only 4 + 3 cycloadducts with excellent relative but poor simple diastereoselection, suggestive of a concerted reaction. The E isomer give a [3 + 2] cycloadduct, enol ether 60, as the major cycloadduct as well as 4 + 3 cycloadducts and chloride-trapping product 61. This result is indicative of a stepwise reaction. The data reflect the importance of allylic cation stereochemistry in the regiochemical and stereochemical outcomes of intramolecular 4 + 3 cycloaddition reactions.
Compounds of a certain formula I, in which Ra and Rb have the meanings indicated in the description, are novel effective compounds with anti-proliferative and apoptosis inducing activity.
Compounds of a certain formula I, in which Ra and Rb have the meanings indicated in the description, are novel effective compounds with anti-proliferative and apoptosis inducing activity.
The present invention provides compounds having an agonistic activity to the cannabinoid receptor, which is represented by the formula (I):
wherein R
1
, R
2
, R
3
, R
4
, and G are defined as herein, a pharmaceutically acceptable salt or a solvate thereof, and pharmaceutical compositions, atopic dermatitis treating agents, and anti-pruritus agents, especially anti-pruritus agents for oral used and for external application, which each contains the said compound as an active ingredient.
NTETRAHYDROPYRIDOTHIOPHENE DERIVATIVES FOR THE TREATMENT OF CANCER
申请人:4SC AG
公开号:EP2051983A1
公开(公告)日:2009-04-29
[EN] NTETRAHYDROPYRIDOTHIOPHENE DERIVATIVES FOR THE TREATMENT OF CANCER<br/>[FR] DÉRIVÉS DU N-TÉTRAHYDROPYRIDOTHIOPHÈNE POUR LE TRAITEMENT DU CANCER
申请人:NYCOMED GMBH
公开号:WO2008020024A1
公开(公告)日:2008-02-21
[EN] Compounds of a certain formula (I), in which Ra and Rb have the meanings indicated in the description, are novel effective compounds with anti-proliferative and apoptosis inducing activity. [FR] La présente invention concerne des composés de formule (I) dans laquelle Ra et Rb ont le sens indiqué dans le mémoire descriptif, lesdits composés étant des composés innovants efficaces ayant une activité anti-proliférative et inductrice de l'apoptose.