The tritiated compounds biphenyl-2-T, -3-T and -4-T have been synthesized by catalytic reduction of the corresponding bromobiphenyls with tritium gas under mild conditions. The specificity of labelling, expressed in of total activity found at the desired position, and determined by degradation of th
Synthesis of specifically-labelled tritiated benzimidazole carbamates
β Scribed by E. Lacey
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- French
- Weight
- 367 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0022-2135
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β¦ Synopsis
Benzimidazole carbamates are thought to exert their biological activity as anthelmintics by binding to helminth tubulin.
To investigate this hypothesis, the synthesis of two specifically-labelled tritlated benzimidazoles, parbendazole and oxibendazole, has been accompliahed. These labels were prepared by debrominatlon of the appropriate 5-bromo analogue using sodium borotritlde in the presence of palladlum chloride. The bromlnated derivatives were syntheslsed by the bromination of the benzimldazole using bromine in glacial acetic acid.
π SIMILAR VOLUMES
Glycosidation of the lactose derivative 4 with [1-13 C]-sialyl sialic acid gave the trisaccharide 5 which was transformed into [1c-13 C]-GM 3 ([1c-13 C]-1). xanthate 3, prepared from enzymatically obtained [1-13 C]-FULL PAPER Scheme 2 Reagents and conditions: (a) PST, AgOTf, CH 3 CN/CH 2 Cl 2 , Οͺ70Β°
## Abstract Efficient methods for synthesising Lβ[methyβ ^13^C]methionine from [^13^C]iodomethane and Lβmethionine, and Lβ[3,4β^13^C~2~] methionine from [^13^C~2~]ethene, are described; the preparation of [3,3β^2^H~2~]methionine and [2,3,3β^2^H~3~]methionine from methionine by an exchange method is
## Abstract Tritiated methylborane prepared from tritium gas and methaneboronic acid was used to prepare [2βH^3^]βtransβ2βphenylcyclopentylamine from 1βphenylcyclopentene with a high specific activity (26Ci/mmol) in 20β40% yield.
## Abstract Tritiated methoxamine with a specific activity of 28.5 Ci/mmol was prepared by iodination of methoxamine followed by catalytic tritiation.