The construction of complex screening libraries requires a series of synthetic chemical reactions, culminating in a versatile, robust, and selective reaction for the high-throughput assembly of the final molecules. Recently, researchers at Merck demonstrated that the heterocyclic assembly of benzimidazoles achieves parallel chemistry libraries with success rates (77%) comparable to the most common late-stage reactions, such as Suzuki and Buchwald-Hartwig cross-coupling. Their approach involves the late-stage transformation of ortho-diamino aromatics and ortho-azidoaldehydes, yielding azabenzimidazoles and azaindazoles, respectively. The resulting heterocyclic cores are among the most prevalent in drug structures.
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