An Activated Sulfonylating Agent That Undergoes General Base-Catalyzed Hydrolysis by Amines in Preference to Aminolysis

Post-synthetic diversification of pyrrole-fused benzosultams via trans-sulfonylations and reactions on the periphery of pyrrole

The synthesis of pyrrole fused benzosultams and their trans-sulfonylation reactions providing workable access to (NH)-2-arylpyrroles containing ortho-sulfonamide functionality and fluorene tethered pyrrole fused benzosultam has been described.

Synthesis, conformation and antiproliferative activity of isothiazoloisoxazole 1,1-dioxides

Isothiazoles (I) reacted with 1,3-dipoles or NaN₃ to give cycloadducts (II) or thiazete (III). Thiazete (III) rearranged to give 1,2,3-oxathiazoline (IV).

Intramolecular azide to alkene cycloadditions for the construction of pyrrolobenzodiazepines and azetidino-benzodiazepines

The coupling of proline- and azetidinone-substituted alkenes to 2-azidobenzoic and 2-azidobenzenesulfonic acid gives precursors that undergo intramolecular azide to alkene 1,3-dipolar cycloadditions to give imine-, triazoline- or aziridine-containing pyrrolo[1,4]benzodiazepines (PBDs), pyrrolo[1,2,5]benzothiadiazepines (PBTDs), and azetidino[1,4]benzodiazepines. The imines and aziridines are formed after loss of nitrogen from a triazoline cycloadduct. The PBDs are a potent class of antitumour antibiotics.