5326-26-1

Upstream product

• 536-74-3 phenylacetylene 
• 607-94-3 N-(2,4,6-trichlorophenyl)acetamide 
• 14763-24-7 (2,6-dichlorophenyl)hydrazine 
• 98-86-2 acetophenone 
• 697-90-5 2,4-dichloro-6-iodoaniline 
• 98-95-3 nitrobenzene 
• 861796-35-2 acetophenone-(2,4-dichloro-phenylhydrazone) 

Relevant academic research and scientific papers

Three-step synthesis of 2,5,7-trisubstituted indoles from: N -acetyl-2,4,6-trichloroaniline using Pd-catalyzed site-selective cross-coupling

We report a facile three-step synthesis of 2,5,7-trisubstituted indoles from N-acetyl-2,4,6-trichloroaniline, with the first step featuring Pd/dihydroxyterphenylphosphine (DHTP)-catalyzed ortho-selective Sonogashira coupling followed by cyclization to afford 2-substituted 5,7-dichloroindoles. Subsequent introduction of aryl or alkenyl groups at the C7 position was achieved by Pd/DHTP-catalyzed site-selective Kumada-Tamao-Corriu coupling, with further substitution of the chlorine at the C5 position (Suzuki-Miyaura coupling or Buchwald-Hartwig amination) affording 2,5,7-trisubstituted indoles.

Methods and systems for preparing fused heterocyclic compounds using copper(I) catalysts

A copper(I)-catalyzed procedure for the synthesis of benzo[b]heterocycles. This protocol can be used to synthesize a variety of 2-arylbenzo[b]furans and indoles in good to excellent yields. This method can tolerate a variety of functional groups, does not require the use of expensive additives and is palladium-free.

Assembly of conjugated enynes and substituted indoles via CuI/amino acid-catalyzed coupling of 1-alkynes with vinyl iodides and 2- bromotrifluoroacetanilides

(Chemical Equation Presented) Cross-coupling of 1-alkynes with vinyl iodides occurs at 80°C in dioxane catalyzed by CuI/N,N-dimethylglycine to afford conjugated enynes in good to excellent yields. Heating a mixture of 2-bromotrifluoroacetanilide, 1-alkyne, 2 mol % of CuI, 6 mol % of L-proline, and K2CO3 in DMF at 80 °C leads to the formation of the corresponding indole. This conversion involves a CuI/L-proline-catalyzed coupling between aryl bromide and the 1-alkyne followed by a CuI-mediated cyclization process. An ortho-substituent effect directed by NHCOCF3 enables me reaction to proceed under these mild conditions. Both aryl acetylenes and O-protected propargyl alcohol can be applied, leading to 5-, 6-, or 7-substituted 2-aryl and protected 2-hydroxymethyl indoles in good yields. With simple aliphatic alkynes, however, lower yields were observed.

Copper(I)-catalyzed coupling of terminal acetylenes with aryl or vinyl halides

Synthetic protocols using copper(I) catalysts for the formation of diaryl acetylenes, 1,3-enynes, benzofurans and indoles are described. Georg Thieme Verlag Stuttgart.

Synthesis of 3,1-Benzothiazines by Cyclisation of 2- Thioformylaminodiphenylacetylenes

2-Formylaminodiphenylacetylenes, obtained in excellent yield by Sonogashira coupling of (2-iodoaryl)formamides with phenylacetylene, were thionated with P4S10 in boiling THF to give 2-thioformylaminodiphenylacetylenes. These acetylenes were cyclised by DBU at ambient temperature to give (4Z)-4-benzylidene-4H-3,1-benzothiazines and small amounts of 2-phenylindoles. The structures of (4Z)-4-benzylidene-6,8-dichloro- 4H-3,1-benzothiazine and 3,5-dichloro-2-thioformylaminodiphenylacetylene were established by single crystal X-ray analysis.