Figure 4. Coupling of 17 and 27 and completion of the synthesis of (+)-batzelladine B (1).
Reagents and conditions: 1. EDC•HCl, DMAP, CH2Cl2, 24 °C, 77%. 2. TFA, Pd/C, argon, 0 °C, then H2, 24 °C, 45% (NMR), 40% (isolated).
Reagents and conditions: 1. EDC•HCl, DMAP, CH2Cl2, 24 °C, 77%. 2. TFA, Pd/C, argon, 0 °C, then H2, 24 °C, 45% (NMR), 40% (isolated).