Efficient construction of new chemical space by way of strategic use of tandem reactions is highly important in drug discovery. Described herein is an atom-economical [4+1+1] annulation approach to 3-(hetero)aryl-4-acyl-3,4-dihydropyrrolo[1,2-a]pyrazines, a new chemical space, via a one-pot three-component reaction under mild reaction conditions. Formation of multiple bonds (one C-C and two C-N) was achieved by a cascade reaction sequence consisting of generation of a Schiff base, a diastereoselective Mannich reaction, and intramolecular imine formation. This modular and environment-friendly process allowed rapid access to a wide range of 4-acylated 3,4-dihydropyrrolo[1,2-a]pyrazines and their analogues, opening opportunity to explore biological activity associated with this scaffold.
Bibliographical noteFunding Information:
We thank the National Research Foundation of Korea (NRF-2017R1A2A2A05069364 and NRF-2018R1A6A1A03023718) for generous financial support.
© 2019 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Organic Chemistry