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Examination of phosphoryl-mimicking functionalities within a macrocyclic Grb2 SH2 domain-binding platform.

Reported herein are the design, synthesis, and Grb2 SH2 domain-binding affinities of several phosphoryl-mimicking groups displayed within the context of a conformationally constrained macrocyclic platform. With use of surface plasmon resonance techniques, single-digit nanomolar affinities were exhibited by phosphonic acid and malonyl-containing diacidic phosphoryl mimetics (for 4h and 4g, K(D) = 1.47 and 3.62 nM, respectively). Analogues containing monoacidic phosphoryl mimetics provided affinities of K(D) = 16-67 nM. Neutral phosphoryl-mimicking groups did not show appreciable binding.