Categories: Synthesis of N-Heterocycles, C-N Bond Formation >
Synthesis of lactams and related compounds
| Synthesis of saturated lactams | ||||
 α-Lactams (Aziridinones) |
 β-Lactams |
 γ-Lactams |
 δ-Lactams |
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Name Reactions
Recent Literature
The reaction of amide and thioamide dianions with epibromohydrin resulted in
regioselective formation of 5-(hydroxymethyl)pyrrolidin-2-ones (pyroglutaminols)
and -thiones.
I. Freifeld, H. Armbrust, P. Langer, Synthesis, 2006, 1807-1808.
An intramolecular vinylation of various iodoenamides using CuI as the
catalyst and N,N'-dimethylethylenediamine as the ligand led to five-
to seven-membered lactams in moderate to excellent yields.
T. Hu, C. Li, Org. Lett., 2005, 7, 2035-2038.
The employment of hydrophobic ionic liquids dramatically enhanced the
activity of metal triflates in Friedel-Crafts alkenylations of aromatic
compounds with various alkyl- and aryl-substituted alkynes.
C. E. Song, D.-U. Jung, S. Y. Choung, E. J. Roh, S.-G. Lee, Angew. Chem.,
2004, 116, 6309-6311.
Optically enriched N-fused
bicyclic amides and small- and medium-ring unsaturated cyclic amines can be synthesized in up to 98% ee
through Mo-catalyzed desymmetrization of
readily available achiral polyene substrates. The effects of catalyst structure,
olefin substitution, positioning of Lewis basic functional groups and ring size
are examined and discussed in detail.
E. S. Sattely, G. Alexander Cortez, D. C. Moebius, R. R. Schrock, A. H.
Hoveyda, J. Am. Chem. Soc.,
2005, 127, 8526-8533.
ROM-RCM of cyclobutenylmethylamines having an alkyne
moiety in a tether afforded
isoquinoline derivatives in good yields using a second-generation Grubbs catalyst.
M. Mori, H. Wakamatsu, K. Tonogaki, R. Fujita, T. Kitamura, Y. Sato, J. Org. Chem., 2005, 70, 1066-1069.
A regioselective one-pot synthesis of 2-alkyl-3,4-dihydro-3-oxo-2H-1,4-benzoxazines
under microwave heating starts from commercially available 2-aminophenols.
Base-mediated regioselective O-alkylation with 2-bromoalkanoates gives
acyclic intermediates. A subsequent intramolecular amidation reaction furnishes
the desired products in good yields.
W.-M. Dai, X. Wang, C. Ma, Tetrahedron, 2005,
61, 6879-6885.
Organic azides are easily and chemoselectively reduced to the corresponding
amines by reaction with dichloroindium hydride under very mild conditions.
γ-Azidonitriles give pyrrolidin-2-imines in an outstanding cyclization.
L. Benati, G. Bencivenni, R. Leardini, D. Nanni, M. Minozzi, P. Spagnolo, R.
Scialpi, G. Zanardi, Org. Lett.,
2006, 8, 2499-2502.
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New
Routes to Heterocycles |
