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. Author manuscript; available in PMC: 2020 Jun 7.
Published in final edited form as: Org Lett. 2019 Mar 21;21(11):3886–3890. doi: 10.1021/acs.orglett.9b00779

Scheme 4. Influence of the Substitution Pattern of the Employed 2-Aminopyridinesa.

Scheme 4.

aStandard conditions: 8 (0.30 mmol), 5a (0.60 mmol), and 9a (0.45 mmol). Isolated yields are reported.