6533b7d1fe1ef96bd125bacc
RESEARCH PRODUCT
Cyclocondensation of alpha-aminonitriles and enones: a short access to 3,4-dihydro-2H-pyrrole 2-carbonitriles and 2,3,5-trisubstituted pyrroles.
Christine WiebeInes BergnerNino MeyerTill Opatzsubject
chemistry.chemical_compoundDeprotonationElectrocyclic reactionchemistryNitrileHydrochlorideOrganic ChemistryOrganic chemistryCondensation reactionChemical synthesisEnonePyrroledescription
The reaction of alpha,beta-unsaturated carbonyl compounds with aminoacetonitrile hydrochloride furnishes 3,5-disubstituted 3,4-dihydro-2H-pyrrole-2-carbonitriles in a one-pot reaction sequence. While these products can serve as starting materials for the preparation of polysubstituted pyrrolizidines, they are kinetically stable against the base-induced elimination of HCN. In contrast, their 2-substituted analogues obtained from alpha-substituted alpha-aminonitriles can be readily converted to the corresponding 2,3,5-trisubstituted pyrroles under microwave irradiation. The key step presumably involves the thermal electrocyclization of a stabilized 2-azapentadienyl anion formed by condensation of the reactants and subsequent deprotonation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-09-28 | The Journal of organic chemistry |