The Dianion Cyclization Strategy for the Synthesis of Dibenzoheterocycles

Abstract

A useful sequence of reaction for the synthesis of a variety of dibenzoheterocycles is described in one-pot. This synthesis involves the initial formation of dianion via deprotonation of Schiff base followed by nucleophilic attack on the suitable dielectrophiles. Products (1-9) were characterized by spectroscopic data and elemental analyses. A plausible mechanistic logic and concept utilized in the synthesis have been discussed in detail.

Synthesis, characterization, and quantitative structure–activity relationship studies of bioactive dehydroacetic acid and amino ether Schiff base complexes

“…In order to corroborate the geometry of the complexes, 29 Si and 119 Sn NMR spectra were recorded and sharp signals from δ −15 to −19 and from δ −105 to −110 were assigned to (R 3 Si) 2 L and R 2 SiL complexes, respectively, which have penta-and hexa-coordinated states around the silicon atom. [31,32] Similarly, in case of tin complexes, sharp signals from δ -150 to −159 and from δ −400 to −415 indicated penta-and hexa-coordinated state around the tin atom for (R 3 Sn) 2 L-and R 2 SnL-type of complexes, respectively ( Fig. 1).…”