The one-pot reaction of β-lactam carbenes with 1-naphthyl
or 5-quinolyl isonitriles followed by treatment with aqueous hydrochloride
produced benzo[h]-δ-carbolin-2,4-diones
or pyrido[3,2-h]-δ-carbolin-2,4-diones,
respectively, in moderate yields. The easy availability of β-lactam
carbenes and aryl isonitriles, and the simple chemical manipulations
render our approach practical in the synthesis of various novel
aryl fused δ-carboline derivatives, which are not easily
prepared by other synthetic methods.
carbenes - β-lactams - isonitriles - benzo[h]-δ-carbolin-2,4-dione - pyrido[3,2-h]-δ-carbolin-2,4-dione