Alkylation de quelques composés carbonylés par des groupes tertiaires. Utilisation de la réaction de friedel-crafts dans la synthèse d'ésters
作者:Claude Lion、Jacques-Emile Dubois
DOI:10.1016/s0040-4020(01)92017-4
日期:1981.1
t-Alkylation of carboxylic esters via their ketene alkyltrimethylsilyl acetals by the Friedal-Crafts reaction allows the synthesis of new highly hindered compounds. A new route using sodium amide in dimethoxyethane, for the preparation of trimethylsilylenol ethers of ketones, is described. The α-t-butylation of these compounds permits the synthesis of new crowded pentasubstituted ketones. The limits
4-dimethyl-2-oxazolines, 4, after hydrolysis of the intermediate enamine. Alkylation of the latter also permits the synthesis of α,α,α-trisubstituted ketones. α,α-Disubstituted ketones have been prepared by addition of organometallic reagents to 4,4-dimethyl-2-oxazolinium salts, 6. The efficiency of this method has been compared to that of other currently used methods.
Compounds, Compositions and Methods for Making the Same
申请人:Vafai Scott
公开号:US20090264496A1
公开(公告)日:2009-10-22
The present invention provides compounds and/or compositions that modulate PP2A methylation and/or activity and methods for preparing the same, which are useful for modulating the demethylation of PP2A, modulating the methylation of PP2A and/or modulating the activity of PP2A.
The present invention relates to compounds useful as inhibitors of protein kinase. The invention also provides pharmaceutically acceptable compositions comprising said compounds and methods of using the compositions in the treatment of various disease, conditions, or disorders. The invention also provides processes for preparing compounds of the inventions.
TRICYCLIC HETEROCYCLIC COMPOUNDS, COMPOSITIONS AND METHODS OF USE THEREOF
申请人:Babu Srinivasan
公开号:US20110201593A1
公开(公告)日:2011-08-18
The invention provides novel compounds of formula I having the general formula:
wherein R
1
, R
2
, R
3
, X and Y are as described herein. Accordingly, the compounds may be provided in pharmaceutically acceptable compositions and used for the treatment of immunological or hyperproliferative disorders.