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Synthesis of PZM21 analogs. Reagents and conditions: a) formaldehyde, sodium triacetoxyborohydride, water, acetonitrile, −10 °C, 5 min (>99 %); b) borane–THF complex, THF, 0 °C to reflux, 6 h (43 %), c) carboxylic acid, BOP or PyBOP, triethylamine, DMF, r.t., 0.5–24 h (56–95 %).
