89651-68-3

Upstream product

• 89651-67-2 ethyl 2-(N-tosylindol-2-yl)acrylate 
• 89651-66-1 N-tosyl-2-carbethoxycarbonyl-indole 
• 31271-90-6 1-(p-toluenesulfonyl)-1H-indole 

Downstream Products

• 89651-75-2 2-Benzyl-5-(1H-indol-2-yl)-5-methyl-6,8-dioxo-5,6,7,8-tetrahydro-[2,7]naphthyridin-2-ium; bromide 
• 89651-81-0 2-benzyl-5-methyl indolo<1,2-b><2,7>naphtyridin-1-(2H)-one 

Relevant academic research and scientific papers

Inter- and intramolecular addition of ester anions to nicotinium salts. A facile approach to nauclefine and ellipticine derivatives

Reaction of ester anions with 1-(2'-indolyl-ethyl)nicotinium chloride and 1-(1'-methyl-2'-indolylethyl)-nicotinium chloride leads to 2,7-naphthyridine-1,3-diones. Acid catalyzed cyclization of the latter yield pentacyclic napthyridocarboline derivatives.