First synthesis of non-symmetrical “phthalimidoyl active ester” bi-dentate cross-linking reagents having an acid chloride, 2-benzothiazole, or 1-benzotriazol group
For the purpose of modification of a variety of derivatives, including biologically important compounds, such as sugar derivatives and proteinsetc., we have first synthesized several non-symmetrical bi-dentate cross-linking reagents, namely 3-(phthalimidoyloxycarbonyl)butyric acid chloride (1), 4-(2-benzothiazolyloxycarbonyl)butyric-N-hydroxyphthalimide ester (4) and 4-(1-benzotriazoleoxa)butyric-N-hydroxyphthalimide ester (5).