## Abstract Syntheses of labelled versions of 5βHT~3~ receptor antagonists, Alosetron and Lurosetron, are described. [^14^C]Alosetron was prepared by routes utilizing either Fischer indolisation of an amidohydrazine or palladiumβmediated cyclisation of an aryl enaminone as key steps. ^2^H and ^13^C
Synthesis of carbon-14 labelled indolic 5HT1 receptor agonists
β Scribed by Ian Waterhouse; Karl M Cable; Ian Fellows; Mark D Wipperman; Derek R Sutherland
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- French
- Weight
- 523 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
β¦ Synopsis
Syntheses of carbon-14 labelled versions of indolic 5HT1 agonists sumatriptan (GR43175) ( 1 ) , GR40370 (2a) and naratriptan (GR85548) (3a) are described.
Introduction of the label via cyanation of ketoforrnanilides, formed by oxidative cleavage of an indole ring, ensured incorporation of carbon-14 at the metabolically stable C-2 position of the indole.
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## Abstract A new antibacterial agent gemifloxacin was labelled with carbonβ14 for studies of pharmacokinetics and metabolism, the label was located in position 3 of the quinolone ring system. The overall radiochemical yield of the 14βstep synthesis, starting from [2β^14^C]sodium acetate was 16.6%,
## Abstract Cytochrome P450 (CYP) enzymes are responsible for much of the phase I oxidative metabolism observed __in vivo__. Many important pharmaceutical compounds are metabolized by CYP. Coβadministration of a drug with another agent can alter the efficacy or the toxicity, especially in cases whe