Synthesis of isotopically labelled pyridoindolone 5-HT3 receptor antagonists (1)
作者:Shimoga R Prakash、Karl M Cable、Itzela D Correa、Lan Fellows、Stephen Montgomery、John J Newman、Lan Waterhouse、Guy N Wells、Derek R Sutherland
DOI:10.1002/jlcr.2580361011
日期:1995.10
Syntheses of labelled versions of 5-HT3 receptor antagonists, Alosetron and Lurosetron, are described. [14C]Alosetron was prepared by routes utilizing either Fischer indolisation of an amidohydrazine or palladium-mediated cyclisation of an aryl enaminone as key steps. 2H and 13C versions of Alosetron were prepared from suitably labelled imidazoles. Lurosetron was labelled in either the methylene bridge carbon or carbonyl carbon, using 14C-labelled paraformaldehyde or phosgene, respectively.