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Preparation of substituted methyl 2-(1H-indazol-1-yl)acetates. Reagents and conditions: (a) Et3N, Boc2O, DMAP, tetrahydrofuran; (b) ArB(OH)2, Pd(PPh3)4, aqueous Na2CO3, 1,4-dioxane, 120 °C; (c) methyl bromoacetate, K2CO3, acetone, 60 °C; (d) alkylmagnesium bromide, Et2O, 0 °C; (e) Dess–Martin periodinane, CH2Cl2; (f) hydrazine hydrate, 175 °C.
