## Abstract Two labeled isotopomers of L‐tyrosine, L‐Tyr, have been synthesized using specific properties of the enzymes phenylanine ammonia lyase, PAL, and L‐phenylalanine hydroxylase. In an intermediate step [1‐^14^C]‐, and [2‐^14^C]‐L‐phenylalanine, L‐Phe, have been obtained from [1‐^14^C]‐, and
Synthesis of carbon-14 labeled 1,4-benzodiazepnies. II.(1) diazepam-14C, demethyldiazepam-14C, and ketazolam-14C
✍ Scribed by Richard S. P. Hsi
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 287 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Diazepam‐^14^C and demethyldiazepam‐^14^C are synthesized from glycine‐1‐^14^C. Addition of diketene to diazepam‐^14^C leads to ketazolam‐^14^C. The reaction conditions for the formation of ketazolam from diazepam is studied using high‐pressure liquid chromatography in conjunction with radioactivity determinations.
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## SYNTtIESIS AHD CHARACTERIZATION OF CARBON-14 LABELLED 4,4'-DIAMINODIPHENYL SULFONE (DAPSONE-l4C; D 3 S -1 4 C > , C.E. B l a c k b u r n and A.J. G l a z k o . D e p a r t m e n t o f P h a r m a c o l o g y . D i v i s i o n of S c i e n t i f i c and M e d i c a l Affairs. P a r k e -D a v i
## Abstract A simple and convenient method for the condensation of paminophenol (I) with ^14^C‐acetic anhydride (II) yields up to 76% of ^14^C‐labelled 4‐hydroxyphenylacetamide (carbonyl‐^14^C) (III). Typical synthesis time is 60 minutes. Radioactive yield is 51%, and specific activity is 0.22 μCi/
## Abstract The synthesis of n‐heptane‐1‐^14^C is described. starting from ^14^CH~3~I via (^14^CH~3~) ~2~Cd and caproyl chloride; for obtaining n‐heptane‐2‐^14^C, n‐pentyl bromide is converted into the Grignard reagent, carbonated with ^14^CO~2~, and the resulted coproic acid is converted into its
## Abstract 1‐[^14^C]‐__α__‐Aminopropanephosphonic acid, with a specific activity of 1.736 µCi mg^−1^, has been prepared from 1‐[^14^C]‐propanal, triphenyl phosphite, and benzyl carbamate by interaction in toluene in the presence of boron trifluoride‐etherate, followed by hydrolysis. The product wa
## Abstract Sodium 6‐[ (R)‐2‐(4‐hydroxy‐1,5‐naphthyridine‐4‐^14^C‐3‐carboxy‐^14^C‐amido)‐2‐phenylacetamido]penicillanate (apalcillin‐^14^C sodium) (**1**) was synthesized for use in metabolic studies. Reaction of ethyl malonate‐1‐^14^C (**2**) with ethyl orthoformate in the presence of zinc chlorid