**Synthesis of 7‐Aminoxanthopterin** 7‐Aminoxanthopterin (II) is obtained in good yield and purity by the transformation of isomer‐free xanthopterin‐7‐carboxylic acid (I) with NH~3~ followed by oxidation with MnO~2~. The Frontier Orbital Theory contributes to a better understanding of the reaction
Über Pterinchemie 76. Mitteilung [1] Eine einfache Synthese von Leucovorin
✍ Scribed by Esam Khalifa; Abhoy N. Ganguly; Jost H. Bieri; Max Viscontini
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- German
- Weight
- 307 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
A Convenient Synthesis of Leucovorin
The synthesis of leucovorin, a 5‐formyl‐(6__R__ or S)‐5,6,7,8‐tetrahydropteroyl‐L‐glutamic acid (II) is described. The L‐folic acid was first reduced to (6__R__, S)‐tetrahy‐dro‐L‐folic acid (I); formylation with methyl‐formate in DMSO gave directly leucovorin (as a diastereomeric mixture) in good yields. To demonstrate, that the formylation occurred regiospecifically at N (5) and not at N (10), N (10)‐nitroso‐(6 R, S)‐tetrahydro‐L‐folic acid was formylated under the same conditions. Reductive elimination of the N (10)‐nitrosogroup gave the identical leucovorin as in the previous case. The synthetic leucovorin was biologically as active as the natural product with Streptococcus faecalis ATCC 8043 and Pediococcus cerevisiae ATCC 8081.
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