1,1-Dichloro- and 1,3-dichloro-2-alkanones react with 2-methylfuran in the presence of lithium perchlorate/triethylamine to form 2-chloro-1-methyl-8-oxabicyclo [3.2.1]oct-6-ene-3-ones predominantly.
Selective transformation of α,α-dibromomethyl ketones into α-monosulfenylated ketones
作者:Marc Boeykens、Norbert De Kimpe
DOI:10.1016/s0040-4020(01)89544-2
日期:1994.1
When α,α-dibromomethyl ketones are treated with sodium thiolates only the α-monosulfenylated ketones are formed. Evidence is put forward that the reaction mechanism proceeds by an initial nucleophilicsubstitution of one bromo atom and reduction by singleelectrontransfer (SET) - hydrogen atom abstraction of the second bromo atom.
Geminal dihalogen isosteric replacement in hydrated AI-2 affords potent quorum sensing modulators
作者:Min Guo、Yue Zheng、Jessica L. Terell、Michal Ad、Clement Opoku-Temeng、William E. Bentley、Herman O. Sintim
DOI:10.1039/c4cc09361e
日期:——
Hydrated carbonyl groups in AI-2, a quorum sensing autoinducer, make key hydrogen bonding interactions in the binding site of LsrR (a transcriptional regulator). This can be recapitulated with geminal dibromides, via halogen bonding. Geminal dihalogens represent interesting isosteric replacements for hydrated carbonyls in ligands and are currently under-utilized in ligand design.
The favorskii rearrangement of dichlorinated methylketones
作者:N. Schamp、N. De Kimpe、W. Coppens
DOI:10.1016/0040-4020(75)80198-0
日期:1975.1
Twenty-two dichlorinated methylketones have been submitted to Favorskiirearrangement in NaOMeMeOH. Distribution of products is strongly dependent on substitution. Primary dichloromethyl-ketones (R2 = H) gave rise to Favorskii esters only. Results are explained by a cyclopropanone intermediate, which is formed stereospecifically by disrotative closure of a delocalized zwitter-ion. Opening of the cyclopropanone