Sathish M, Nachtigall FM, Santos LS. Enantioselective Imine Reduction of Dihydro-β-carbolines by Fe-Thiosquaramide Catalyst.
Org Lett 2022;
24:7627-7631. [PMID:
36219882 DOI:
10.1021/acs.orglett.2c03093]
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Abstract
Enantioselective imine reduction of dihydro-β-carbolines (DHBCs) is a reliable and powerful tool to construct bioactive chiral tetrahydro-β-carbolines (THBCs). Here, we report an efficient enantioselective imine reduction employing in situ generated Fe-thiosquaramides (Fe-TSQs) 3a and 3b as asymmetric organometallic catalysts to produce chiral THBCs (2a-h). The catalyst 3a at 15 mol % was found to be suitable for the substrates with alkyl and aryl groups which afford corresponding chiral THBCs with excellent enantioselectivities (up to ee 99%).
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