The invention relates to a compound of formula (I): or pharmaceutically acceptable salts, solvates, tautomers, stereoisomers or mixtures thereof; wherein the fused ring moiety is a non-alkylating moiety; and wherein the compounds are useful as medicaments, in particular for use as a drug in an antibody-drug conjugate and in the treatment of a proliferative disease, a bacterial infection, a malarial infection and inflammation.
Phosphine-catalyzed [3 + 2] and [4 + 2] annulation reactions of ynones with barbiturate-derived alkenes
The phosphine-catalyzed [3 + 2] annulation reaction of ynones and barbiturate-derived alkenes has been developed with the assistance of a weak acid, giving functionalized spirobarbiturate-cyclopentanones in moderate to excellent yields with excellent E/Z stereoselectivity. An unprecedented [4 + 2] annulation of ynones with barbiturate-derived alkenes was also achieved in the presence of a phosphine