854923-38-9Relevant academic research and scientific papers
Regioselective dibromination of methyl indole-3-carboxylate and application in the synthesis of 5,6-dibromoindoles
Parsons, Thomas B.,Ghellamallah, Cedric,Male, Louise,Spencer, Neil,Grainger, Richard S.
, p. 5021 - 5023 (2011)
Treatment of methyl indole-3-carboxylate with bromine in acetic acid gives methyl 5,6-dibromoindole-3-carboxylate regioselectively, from which the parent 5,6-dibromoindole can be accessed via a one-pot, microwave-mediated ester hydrolysis and decarboxylation. Application of these building blocks in syntheses of natural and non-natural 5,6-dibromoindole derivatives, including meridianin F and 5,6-dibromo-2′-demethylaplysinopsin, is reported. The Royal Society of Chemistry 2011.
Synthesis of (S)-5,6-dibromo-tryptophan derivatives as building blocks for peptide chemistry
Mollica, Adriano,Stefanucci, Azzurra,Feliciani, Federica,Lucente, Gino,Pinnen, Francesco
, p. 2583 - 2585 (2011)
5,6-Dibromo-tryptophan is an interesting amino acid whose derivatives and analogues are found in a variety of highly bioactive natural compounds. Notwithstanding its relevance no data concerning this compound are found in the literature. Here an efficient pathway for the synthesis of 5,6-dibromo- tryptophan derivatives is reported. The reaction is performed by using 6-Br-isatin as starting material. Selective bromination at position 5 was followed by BH3 reduction of the intermediate α-keto-amide and alkylation with Ser-OH in Ac2O/AcOH. Optical resolution was effected by enzymatic de-acetylation of the obtained racemic mixture. Finally, in situ Nα-Boc protection of the optically pure S form yielded the desired Nα-Boc-(S)-5,6-dibromo-tryptophan.
Tanjungides a and B: New antitumoral bromoindole derived compounds from Diazona cf formosa. isolation and total synthesis
Murcia, Carmen,Coello, Laura,Fernandez, Rogelio,Martin, Maria Jesus,Reyes, Fernando,Francesch, Andres,Munt, Simon,Cuevas, Carmen
, p. 1116 - 1130 (2014/03/21)
Tanjungides A (1) (Z isomer) and B (2) (E isomer), two novel dibrominated indole enamides, have been isolated from the tunicate Diazona cf formosa. Their structures were determined by spectroscopic methods including HRMS, and extensive 1D and 2D NMR. The stereochemistry of the cyclised cystine present in both compounds was determined by Marfey's analysis after chemical degradation and hydrolysis. We also report the first total synthesis of these compounds using methyl 1H-indole-3-carboxylate as starting material and a linear sequence of 11 chemical steps. Tanjungides A and B exhibit significant cytotoxicity against human tumor cell lines.
