Catalytic Asymmetric Protonation of Silyl Ketene Imines
摘要:
An efficient catalytic and highly enantioselective protonation of silyl ketene imines is described. The reaction is catalyzed by the chiral phosphoric acids TRIP or STRIP in the presence of a stoichiometric amount of methanol as the proton source and silyl acceptor. A variety of substituted racemic silyl ketene imines have been transformed into highly enantioenriched nitriles.
diameter of about 70 A is observed on the Pd(nano)/HT surface by transmission electron microscopy analysis. These hydrotalcite-supported metal catalysts can effectively promote alpha-alkylation reactions of various nitriles with primary alcohols or carbonylcompounds through tandem reactions consisting of metal-catalyzed oxidation and reduction, and an aldol reaction promoted by the base sites of the
Spiro-imidazolones for treatment of diabetic complications
申请人:PFIZER INC.
公开号:EP0171213A1
公开(公告)日:1986-02-12
Spiro-imidazolones of formula are disclosed
wherein:
X is oxygen or sulfur;
Y is hydrogen, halo or alkyl and
R is hydrogen, methyl or ethyl,
which are useful as aldose reductase inhibitors and as therapeutic agents for the treatment of complications arising from diabetes. Pharmaceutical compositions containing the spiro compounds and a method of treating diabetic complications are also disclosed.
[EN] SPIRO-IMIDAZOLONES FOR TREATMENT OF DIABETES COMPLICATIONS
申请人:PFIZER INC.
公开号:WO1986000807A1
公开(公告)日:1986-02-13
(EN) Spiro-imidazolones which are useful as aldose reductase inhibitors and as therapeutic agents for the treatment of complications arising from diabetes. Pharmaceutical compositions containing the spiro compounds and a method of treating diabetic complications are also disclosed.(FR) Spiro-imidazolones utiles comme inhibiteurs d'aldose réductase et comme agents thérapeutiques pour le traitement de complications dues au diabète. Des compositions pharmaceutiques contenant les spiro-composés et une méthode pour le traitement des complications à la suite du diabète.