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. Author manuscript; available in PMC: 2021 Apr 24.
Published in final edited form as: Chemistry. 2020 Apr 9;26(24):5441–5448. doi: 10.1002/chem.201905795

Scheme 4.

Scheme 4.

Synthesis of intermediate 9: i) BF3•Et2O, TMSN3, CH2Cl2; ii) NaOMe, MeOH; iii) TBDMSCl, pyridine; iv) DMTCl, pyridine; v) Pd/CaCO3, H2, EtOH; vi) DIPEA, 5, EtOH; vii) Phenoxyacetic acid, PyBOP, DIPEA, CH2Cl2; viii) Et3N•3HF, THF.