Facile Stereoselective Synthesis of γ-Substituted γ-Amino Acids from the Corresponding α-Amino Acids. -The mild and short procedure presented is compatible with common side-chain protecting groups, sensitive functionalities and preserves the chirality of the starting α-amino acid.
Facile stereoselective synthesis of γ-substituted γ-amino acids from the corresponding α-amino acids
✍ Scribed by Martin Smrcina; Pavel Majer; Eva Majerová; Tatiana A. Guerassina; Michael A. Eissenstat
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 459 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0040-4020
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✦ Synopsis
A lacile slereoselcctive melhod Ior the synthesis of y-substituted, y-mnino acids from of amino acids was developed. The key step of the procedurc is complete reduction of Ihe keto functionality of ot-~unino acyl Meldruln's acid by sodium acetoxyborohydride. The resulting amino alkyl Meldrum's acid undergoes thermal decarboxylative ring closure to a 5-substituted pyrrolidinone which yields Ihe correslxmding y-amino acid after ~sic hydrolysis. The over',dl yield of the procedure ranges ti'om 40 to 65~7,.
📜 SIMILAR VOLUMES
## Abstract (__R__)‐(−)‐2‐Amino‐4‐fluorobutyric acid (4c) (32% ee) and six of its homologues 9 have been synthesized by diastereoselective alkylation (54–72% yield) of (__R__)‐(+)‐camphor‐based glycine ester imines 1 with 1‐bromo‐2‐fluoro‐alkanes 6, at low temperature, followed by deprotection. Sim