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We herein report the efficient chiral synthesis of DHP derivatives. In contrast to the techniques used previously 3 in our enantioselective Hantzsch variant the chirality information is introduced using two different -keto esters. The separation of respective enantiomers of 1a is achieved using enzymatic method and calcium channel antagonist activity of the synthesised pure enantiomers is under progress.

Synthesis of chiral 4-pyrazolyl dihydropyridines and their enantiomeric separation