α-Bromodiazoacetamides - a new class of diazo compounds for catalyst-free, ambient temperature intramolecular C-H insertion reactions.
In this work, we introduce a new class of halodiazocarbonyl compounds, α-halodiazoacetamides, which through a metal-free, ambient-temperature thermolysis perform intramolecular C-H insertions to produce α-halo-β-lactams. When carried out with α-bromodiazoacetamides bearing cyclic side chains, the thermolysis reaction affords bicyclic α-halo-β-lactams, in some cases in excellent yields, depending on the ring size and substitution pattern of the cyclic amide side chains.
Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, NO-0315 Oslo, Norway.
Asmund
A
Kaupang
Tore
T
Bonge-Hansen
diazo; halocarbonylcarbene; halogenation; thermolysis; α-halo-β-lactam