Scheme 2.
The synthesis of the BN analogs (2–5). Reagents and conditions: (i) Ac2O, DMAP, Py, r.t., 24 h; (ii) (i-PrO)3Al, i-PrOH, 80 °C, 2 h; (iii) SA or DMSA, DMAP, Py, reflux, 18–20 h; (iv) SA, Py, reflux, 9 h.
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