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The synthesis route of compounds 5a–5c and 6a–6c. Reagent and conditions: (a) Ac2O, Et3N, DCM, 1 h, (b) imidazole, DMF, 0.5 h, (c) propargyl bromide, DMF, 1 h, (d) D1–D3, CuI, Et3N, acetonitrile, 1 h, (e) MeOH/MeONa, 0.5 h, (f) Ac2O, Et3N, pyridine, 4 h, (g) HBr-AcOH, DCM, 2 h, (h) NaN3, DMF, 4 h.
