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Dinuclear Ni complexes supported by naphthyridine‐diimine (NDI) ligands catalyze the reductive cyclopropanation of alkenes with CH2Cl2 as the methylene source. The use of mild terminal reductants (Zn or Et2Zn) confers significant functional‐group tolerance, and the catalyst accommodates structurally and electronically diverse alkenes. Mononickel catalysts bearing related N chelates afford comparatively...
Um ihreC2‐Symmetrie zu brechen, wurden Bis(oxazolin)‐Liganden für die kupferkatalysierte asymmetrische Cyclopropanierung von 1,2‐disubstituierten Alkenen mit angehängten Gruppen versehen. Unter milden Bedingungen konnten sowohl cis‐ als auch trans‐1,2‐substituierte Alkene hoch diastereo‐ und enantioselektiv in die entsprechenden 1,2,3‐trisubstituierten Cyclopropane umgewandelt werden (siehe Schema).
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