Enantiomeric Recognition of Racemic 4-Aryl-1,4-dihydropyridine Derivatives via Chiralpak AD-H Stationary Phases
作者:Zhi Dai、Charles U. Pittman、Tingyu Li
DOI:10.1002/chir.22083
日期:2012.10
The chromatographic chiral resolution of two new series of racemic 4‐substituted‐1,4‐dihydropyridine derivatives was studied on a commercial Chiralpak AD‐H column. Analytes without 5,5‐dimethyl substituents (1–15) are more efficiently resolved than analytes with 5,5‐dimethyl groups (16–30). The AD‐H column discriminated between enantiomers through both hydrogen bonding attractions and π–π interactions
Solvent-free synthesis of polyhydroquinoline and 1,8-dioxodecahydroacridine derivatives through the Hantzsch reaction catalyzed by a natural organic acid: A green method
ABSTRACT Solvent-free and high yielding one-pot synthesis of 1,8-dioxodecahydroacridine and polyhydroquinoline derivatives have been described through Hantzsch condensation of various aldehydes, ammonium acetate with cyclic 1,3-dicarbonyl compounds and ethyl acetoacetate in a very simple, efficient, and environmentally benign method using ascorbic acid as a nontoxic organocatalyst. GRAPHICAL ABSTRACT