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FIGURE 2
Conditions for the synthesis of compounds G2-4 – G2-6. (a) Pyridine, CuBr, mol sieve (4 Å), DMSO, 90°C, compressed air (b) 1. NaHCO3, Et2O/H2O, rt, 16 h and 2. MeOH, TEA, rt, 16 h (c) inert atm., DMF, TEA, 80°C, 2 h, EA, H2O (d) TEA, DMF, 80°C, 2 h:
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