Scheme 4.
Reagents and conditions: (a) 3-Amino-5-cyclopropylpyrazole, Et3N, NaI, DMA, microwave, 150 °C; (b) R1R2NH, n-BuOH, microwave, 170 °C; (c) R3PhB(OH)2, Pd(PPh3)4, copper(I) thiophene carboxylate, dioxane, microwave, 150 °C.
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