Synthesis of cyclobutane-containing tricyclic β-lactams based on a saturated scaffold enabled by iron-catalysed (2 + 2)-cycloaddition - Freitag, Lea; Zeh, Johannes; Ziegenhagen, Levi A.; Becker, Felix J.; Roşca, Dragoş-Adrian (Chemistry - a European journal, 2025)
Im Titel steht der Ausdruck "2 + 2" in eckiger Klammer