Synlett 2022; 33(06): 513-517
DOI: 10.1055/a-1705-0307
synpacts

Access to Chiral 1-Aminoindene Derivatives by Asymmetric Brønsted Acid Catalysis

Xiang Wu
This work was supported by the Fundamental Research Funds for the Central Universities of China (grant nos. PA2020GDKC0011, PA2021GDKC0068) and the Guangdong Provincial Key Laboratory of Catalysis (grant no. 2020B121201002).


Abstract

Asymmetric organocatalysis is emerging as an elegant tool for accelerating chemical reactions and creating specific types of molecules. Chiral Brønsted acid catalysis is an important area of organocatalysis. We recently described an intramolecular iminium-ion cyclization reaction of 2-alkenylbenzaldimines catalyzed by a chiral Brønsted acid (a BINOL-derived N-triflylphosphoramide) for the synthesis of chiral 1-aminoindenes and tetracyclic 1-aminoindanes in good yields and high enantioselectivities. One of the resulting 1-aminoindenes is a useful intermediate for the synthesis of (S)-rasagiline, an effective drug for the symptomatic treatment of Parkinson’s disease. Moreover, some tetracyclic 1-aminoindanes are present in the skeletons of homoisoflavanoid natural products such as brazilin.



Publikationsverlauf

Eingereicht: 10. November 2021

Angenommen nach Revision: 24. November 2021

Accepted Manuscript online:
24. November 2021

Artikel online veröffentlicht:
21. Dezember 2021

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