Scheme 1.
Synthesis of cinnamoyl˗benzoxaborole amides 5a–g. Reagents and conditions: (i) 99% HNO3, −30 °C, 3 h; (ii) H2, Pd/C, r.t, 2 h; (iii) DCM, Et3N, POCl3 and then (iv) DMAP.
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