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(a) Pseudomonas cepacia lipase, potassium phosphate buffer pH 7.4, acetone, 1 N NaOH; (b) NaH, DMF, Pd2(dba)3, DPPP, N3-benzoylated-5-bromouracil, 55 °C, 72 h; (c) methanolic ammonia, rt; (d) for 1a, tributylstannyl thiophene, dioxane, PdCl2(PPh3)2; for 1b, tributylstannyl furan, dioxane, PdCl2(PPh3)2; for 1c, tributylstannyl thiazole, THF, Pd(PPh3)4.
