4 research outputs found
Synthesis of Cyclo[<i>b</i>]fused Carbazoles via SnCl<sub>4</sub>‑Mediated Domino Reaction of 2‑Indolylmethylpivalates with Arenes and Heteroarenes
A straightforward
synthesis of aryl and heteroaryl-annulated cycloÂ[<i>b</i>]Âcarbazoles has been developed via SnCl<sub>4</sub>-mediated
one-pot arylation, cyclization and aromatization reaction sequence
from 3-acetyl/aroyl-2-pivaloyloxymethylindoles. The starting material
is easily accessible from commercially available 2-methylindole via
Friedel–Crafts acylation, bromination and pivaloylation. Remarkably,
electron withdrawing/donating aroyl units including heterocyclic systems
are well tolerated in the present domino reaction protocol. Furthermore,
this methodology could be extended to the synthesis of dibenzofurocarbazole
via bis-annulation of 2,5-bisÂ(2-pivaloyloxymethyl)Âpyrrole
Synthesis of Cyclo[<i>b</i>]fused Carbazoles via SnCl<sub>4</sub>‑Mediated Domino Reaction of 2‑Indolylmethylpivalates with Arenes and Heteroarenes
A straightforward
synthesis of aryl and heteroaryl-annulated cycloÂ[<i>b</i>]Âcarbazoles has been developed via SnCl<sub>4</sub>-mediated
one-pot arylation, cyclization and aromatization reaction sequence
from 3-acetyl/aroyl-2-pivaloyloxymethylindoles. The starting material
is easily accessible from commercially available 2-methylindole via
Friedel–Crafts acylation, bromination and pivaloylation. Remarkably,
electron withdrawing/donating aroyl units including heterocyclic systems
are well tolerated in the present domino reaction protocol. Furthermore,
this methodology could be extended to the synthesis of dibenzofurocarbazole
via bis-annulation of 2,5-bisÂ(2-pivaloyloxymethyl)Âpyrrole
Synthesis of Cyclo[<i>b</i>]fused Carbazoles via SnCl<sub>4</sub>‑Mediated Domino Reaction of 2‑Indolylmethylpivalates with Arenes and Heteroarenes
A straightforward
synthesis of aryl and heteroaryl-annulated cycloÂ[<i>b</i>]Âcarbazoles has been developed via SnCl<sub>4</sub>-mediated
one-pot arylation, cyclization and aromatization reaction sequence
from 3-acetyl/aroyl-2-pivaloyloxymethylindoles. The starting material
is easily accessible from commercially available 2-methylindole via
Friedel–Crafts acylation, bromination and pivaloylation. Remarkably,
electron withdrawing/donating aroyl units including heterocyclic systems
are well tolerated in the present domino reaction protocol. Furthermore,
this methodology could be extended to the synthesis of dibenzofurocarbazole
via bis-annulation of 2,5-bisÂ(2-pivaloyloxymethyl)Âpyrrole
Synthesis of Calothrixins and Its Analogs Using FeCl<sub>3</sub>‑Mediated Domino Reaction Protocol
A novel one pot synthesis of calothrixin B and its analogs is achieved involving an FeCl<sub>3</sub>-mediated domino reaction of enamines in dry DMF at reflux. Alternatively, the enamines upon interaction with CuBr<sub>2</sub> in DMF at reflux led to the formation of 1-phenylsulfony-2-(2′-nitroaryl)-4-hydroxycarbazole-3-carbaldehydes in excellent yields