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).
Syntheses and reactivities of non-symmetrical “active ester” bi-dentate cross-linking reagents having a phthalimidoyl and acid chloride, 2-benzothiazole, or 1-benzotriazole group
active ester” bi-dentate cross-linking reagents having an acid chloride, 2-benzothiazole, or 1-benzotriazole group (i.e., 9, 15, and 16) on the basis of the reactivity study of the “active ester” model compounds, 11–14, toward the various nucleophiles and examined their reaction selectivity towards the same nucleophiles. Then, we applied for the modification of cholesterol at the more reactive site of