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DOI: 10.1055/a-2085-5256
Asymmetric Transfer Hydrogenation of Heterocyclic Compounds in Continuous Flow Using an Immobilized Chiral Phosphoric Acid as the Catalyst
These studies have been supported by the National Science Foundation (NSF) (Grant No. CHE-1955069).
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This manuscript is dedicated to Professor David A. Evans.
Abstract
This manuscript describes transfer hydrogenation of bicyclic nitrogen-containing heterocyclic compounds using the immobilized chiral phosphoric acid catalyst (R)-PS-AdTRIP in batch and continuous flow. A significant improvement in enantioselectivities is achieved in continuous flow with a fluidized bed reactor packed with (R)-PS-AdTRIP when the flow rate is increased from 0.2 mL/min to 2.0–2.5 mL/min. The optimized continuous flow conditions consistently provide 4–6% ee higher selectivity than transfer hydrogenation in batch with 2 mol% of (R)-PS-AdTRIP, and are used to generate multiple chiral products with the same fluidized bed reactor.
Key words
transfer hydrogenation - chiral phosphoric acid - continuous flow - enantioselectivity - heterocyclesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2085-5256.
- Supporting Information
Publication History
Received: 11 March 2023
Accepted after revision: 03 May 2023
Accepted Manuscript online:
03 May 2023
Article published online:
29 June 2023
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