Hutaneg Pharma, a boronic acid pinacol ester supplier, provides high purity (E)-1-Ethoxyethene-2-boronic acid pinacol ester CAS no. 1201905-61-4, a boronic ester used in Suzuki−Miyaura cross-coupling reactions. It can be used to synthesize azaindole and diazaindoles from chloroamino-N-heterocycles.