Scheme 3. Synthesis of 4-Aminopyrimidine and 2-Aminopyridine Derivativesa.
aReagents and conditions: (a) K2CO3 or Cs2CO3, MeCN, overnight. (b) Pd(t-Bu3P)2, KF, 1,4-dioxane, water, MW irradiation, 150 °C, 40 min. (c) (i) Pd2(dba)3, BINAP, t-BuONa, benzophenone imine, toluene, 80 °C, overnight; (ii) 1 M HCl, THF, 5 h.