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. 2022 Jun 10;27(12):3752. doi: 10.3390/molecules27123752

Scheme 4.

Scheme 4

Reagents and conditions: (i) Tf2O, TEA, DCM, rt, 1 h in accordance with ref. [56]; (ii) pyridin-3- or pyridin-4-yl boronic acid, Pd(PPh3)4, Cs2CO3, KBr, EtOH, 80 °C, 150 W, 10 min; (iii) appropriate carbaldehyde, NaOH, EtOH, 55 °C, 10 min.