53855-47-3Relevant articles and documents
Novel synthesis of fused indoles and 2-substituted indoles by the palladium-catalyzed cyclization of N-cycloalkenyl-o-haloanilines
Maruyama, Jun,Yamashita, Hiromichi,Watanabe, Takeshi,Arai, Shigeru,Nishida, Atsushi
experimental part, p. 1327 - 1335 (2009/04/10)
A new palladium-catalyzed cyclization of N-alkenyl-o-haloanilines with selective isomerization of a double bond followed by formal 5-endo-trig cyclization was developed. A variety of fused and 2-substituted indoles were synthesized from enaminoesters prepared by condensation of β-ketoesters and o-iodoaniline.
Transformations of phenylhydrazones of dialkyl 2-oxo-propane-1,3- dicarboxylate and of ethyl acetoacetate in concentrated sulfuric acid
Bevk, David,Svete, Jurij,Stanovnik, Branko
, p. 1413 - 1415 (2007/10/03)
The hydrazones 3a,b, prepared from phenylhydrazine (1) and dialkyl 2-oxopropane-1,3-dicarboxylate (2a,b) were converted in concentrated sulfuric acid at -5 °C into a mixture of alkyl (3-carboxyindol-2-yl)acetates (5a,b), and ethyl (5-ethoxy-1-phenyl-1H-pyrazol-3-yl)acetate 6. The hydrazone 8, prepared from 1 and ethyl acetoacetate (7) was transformed under the same conditions into a mixture of five compounds: ethyl 2-methylindol-3-carboxylate (9), 2-methylindol-3-carboxylic acid (10), 2-methylindol (11), 5-ethoxy-3-methyl-1-phenyl-1H-pyrazole (12), and 3-methyl-1-phenyl-1H-pyrazol-5- one (13).
Fischer Indole Synthesis of 3-Acyl and 3-Alkoxy-carbonylindoles
Mills, Keith,Khawaja, Ibtisam K. Al,Al-Saleh, Fowzia,Joule, John A.
, p. 636 - 641 (2007/10/02)
N-Benzyl-N-phenylhydrazine derivatives of 1,3-diketones and 1,3-ketoesters undergo normal Fischer cyclisations to indoles, but no method could be found for the subsequent removal of the N-protecting group.No method could be found for the indolisation of N-aroyl-N-phenylhydrazine derivatives of dimedone with retention of the N-protecting group, though heating in tetralin did effect the electrocyclic step of the Fischer sequence and the formation of a carbon-carbon bond.