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. 2023 May 19;28(10):4199. doi: 10.3390/molecules28104199

Scheme 1.

Scheme 1

Synthetic route for target compounds 2–20. Reagents and conditions (i) CH3OH, conc. H2SO4, rt 24 h; (ii) freshly prepared CH3ONa, rt 2-3 h; TR1, rt, 24–48 h. For R See Table 1 and Table 2.