（ N -异氰亚氨基）三苯磷

(N-Isocyanoimino)triphenylphosphorane (Pinc) is a bench-stable solid reagent widely used in organic synthesis. It is an amphoteric compound with unique properties that make it a versatile tool for various applications, including heterocycle synthesis and macrocyclization of peptides. Pinc facilitates cyclization and incorporation of a conformational control element into peptide macrocycles, leading to desired drug properties such as improved membrane permeability, lipophilicity, and aqueous solubility. Its ability to form oxadiazoles offers opportunities for the development of new transformations.

As reported by the lab of Andrei Yudin, Pinc enables zwitterionic-controlled generation of peptide macrocyles from linear peptides and aldehydes. It enables the formation of disubstituted 1,3,4-oxadiazoles by intercepting the key mixed anhydride characteristic of the Ugi reaction. Furthermore, the resulting peptide macrocycles containing oxadiazole exhibit improved drug properties such as cell-permeability and a rigid conformation.