Scheme 5.
a) 2,4,6-trichlorobenzoylchloride, Et3N, DMAP, toluene, 68%; b) TBAF (1M in THF, PH=6.5), THF, 40 C, 79%; c) 1,2-Dimethylimidazole, THF, rt, 69%; d) NH4HCO2, Pd(OH)2/C, Pd/C, MeOH/CH2Cl2, 71%.
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