been studied and analyzed using the empirical Kamlet–Taft solvent polarity parameters π* (dipolarity/polarizability), α (hydrogenbond donating ability), and β (hydrogenbond accepting ability). Reasonable Kamlet–Taft solvatochromic correlations (r > 0.95) were established for the three amide derivatives 3–5 in a range of common solvents and three room temperature ionic liquids (RTILs). The UV/Vis absorption
A process for resolving racemic .alpha.-hydroxy-.beta.,.beta.-dimethyl-.gamma.-butyrolactone, referred to as D,L-pantolactone, into its optical antipodes, based on the separation of diastereomeric salts of D,L-pantoic acid (.alpha.,.gamma.-dihydroxy-.beta.,.beta.-dimethylbutyric acid), produced from D,L-pantolactone, by means of (-)-3-aminomethylpinane, (+)-3-aminomethylpinane or one of their acid addition salts, as a new resolving agent.
Sorbinil by optical resolution with aminopinane derivatives
申请人:PFIZER INC.
公开号:EP0109231A1
公开(公告)日:1984-05-23
Sorbinil is obtained by optical resolution of racemic 2,3-dihydrospiro-6-fluoro[4H-1-benzopyran-4,4'-imidazolidine]-2',5'-dione either (a) by direct resolution via the (-)-3-aminomethylpinane salt of sorbinil or (b) by a double resolving agent technique via a mother liquor concentrate of either the (+)-3-aminomethylpinane or the (-)-2-amino-2-norpinane salt of sorbinil, followed by the quinine salt of sorbinil.
Practical Way to Imidazo[4,5-b] and [4,5-c]Pyridine-2-ones via Cascade Ureidation/Palladium-Catalyzed Cyclization
作者:Franck Lach、Patrice Koza
DOI:10.1021/co300078f
日期:2012.9.10
We developed an efficient one-pot tandem carbamoyl chloride amination and palladium-catalyzed intramolecular urea cyclization, which furnished high-throughput access to imidazo[4,5-b]pyridine-2-one and related imidazo[4,5-c]pyridine-2-one ring systems. Moderate to excellent yields were reported.