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Highly asymmetric reduction of new benzofuryl and benzothiophenyl α-amino ketones
* 1 , 2 , 2
1  Nicolaus Copernicus University in Torun, Faculty of Chemistry
2  Adam Mickiewicz University, Faculty of Chemistry


Heterocyclic compounds play an important role in the medicinal chemistry and occupy a central position in synthetic organic chemistry. Both benzofuran and benzothiophene are considered as very important structures due to their diverse biological and pharmacological profile. Many of the clinically approved drugs are synthetic and naturally occurring substituted benzofuryl and benzothiophenyl derivatives in conjunction with other heterocycles. Therefore a new series of α-amino ketones (containing various azole rings) derivatives of benzofuran and benzothiophene were synthesized and subjected to the transfer hydrogenation with formic acid, catalyzed by RhCl[(R,R)-TsDPEN](C5Me5). The corresponding optically active β-amino alcohols were obtained in high yields and excellent enantioselectivities (93-99%), as determined by chiral HPLC. The absolute configuration of the products was confirmed by means of ECD spectroscopy supported by theoretical calculations.

Keywords: heterocycles-asymmetric transfer hydrogenation-β-amino alcohol-benzofuran-benzothiophene