## Abstract The 2‐carbon units, glycine and glyoxylate are combined by a mild reaction via the copper chelate of glycine. The resulting β‐hydroxy aspartic acid is converted to DL‐malic acid by means of hydroxylamine 0‐sulfonic acid. The overall yields are in the range of 35–50% in submillimolar pre
A general approach to the synthesis of 14C-labeled photoactive acrylic acids
✍ Scribed by Taj Mohammad; Harry Morrison
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- French
- Weight
- 325 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
Condensation of aromatic carboxaldehydes with [2‐^14^C]‐malonic acid under Knoevenagel conditions provides corresponding β‐aryl substituted [α‐^14^C]‐acrylic acids. The reaction is applicable to both aromatic and heteroaromatic aldehydes under controlled reaction conditions leading to moderate to good yields.
📜 SIMILAR VOLUMES
## Abstract A convenient method for the synthesis of phenylmethyl N‐methyl (carboxy‐^14^C) glycine hydrochloride (Z) is described. It involves the carboxylation of transmetalated organostannane compound 4 which itself is accessible by established procedure. Success in preparing the labelled amino a
14C-labeled chlorogenic acid (specijic activity 30.6 nCilmg) was synthesized by reaction of diphenylmethyl-I-0-ethoxy-carbonyl- 4,5-0-isopropylidenequinate ( V ) with 0,O-dimethylcarbonyl caffeoyl chloride-u-14C (VIII) followed by selective hydrolysis of the protecting groups.
## Abstract p‐Toluic acid‐ring‐^14^C was synthesized by the Friedel‐Crafts p‐carbamylation of toluene‐ring‐^14^C with N,N‐disubstituted carbamyl chloride and subsequent hydrolysis. The radiochemical yield was 61%. An attempt was made to apply this method for the synthesis of benzoic acid‐ring‐^14^C
A thod is described for the preparation of 5-bromopentanoic--5 & acid which is inserted the Wittig ylid into the desired prostaglandin intermediate in the 1 ast carbon-carbon bond forming step of the Corey synthesis. Thr diffe nt prostaglandins were prepared carbon-labeled (both pgC and i5Q in the m