Synthesis of .alpha.-diketones by direct, low-temperature, in situ nucleophilic acylation of esters by acyllithium reagents
摘要:
Addition of n-, sec-, or tert-butyllithium to a CO-saturated solution of an ester, R'CO2R'' in a solvent system of 4:4:1 (by volume) THF/Et2O/pentane at -110-degrees-C (or at -135-degrees-C in 3:1 (by volume) Me2O/THF), followed by hydrolysis with saturated aqueous NH4Cl, results in the formation of alpha-diketones, BuC(O)C(O)R', yellow liquids, in good yield. Similar reactions with diethyl succinate gave in one instance both t-BuC(O)C(O)CH2CH2CO2Et and t-BuC(O)C(O)CH2CH2C(O)C(O)Bu-t. The monoacylation product of dimethyl oxalate, t-BuC(O)C(O)CO2Me, readily formed a crystalline hydrate, t-BuC(O)C(OH)2CO2Me.
Festkörper für das Abgeben von Duftstoffen und/oder Desinfektionsmitteln
申请人:Consortium für elektrochemische Industrie GmbH
公开号:EP0126791A2
公开(公告)日:1984-12-05
Festkörper für das Abgeben von Duftstoffen und/oder Desinfektionsmitteln, die zusätzlich zu Duftstoff und/oder Desinfektionsmittel mindestens einen sublimierbaren Stoff enthalten, wobei der sublimierbare Stoff zumindest teilweise aus Hexamethylcyclotrisiloxan und/oder Tetramethylcyclobutandion besteht.
Provided are novel specific dipyridyl derivatives as a useful substance or an intermediate in the fields of pharmaceuticals, agrichemicals, ligands, silver halide photosensitive materials, liquid crystals, surfactants, electrophotography and organic electroluminescence.
THERAPEUTICALLY ACTIVE COMPOSITIONS AND THEIR METHODS OF USE
申请人:AGIOS PHARMACEUTICALS, INC
公开号:US20170210749A1
公开(公告)日:2017-07-27
Provided are compounds of formula (I), wherein X, Y, Z, W, V, R
2
, R
3
and m are defined as in the description. Their pharmaceutical compositions and their uses for treating cancers are also provided.