N-Thioacylation of β-Amino Alcohols by N-(Thioacyl)phthalimides: A Facile Synthesis of α-Amino Acid Thiazolines
✍ Scribed by Christopher T Brain; Allan Hallett; Soo Y Ko
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 481 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
~arnino alcohols are selectivelyN-thioscylatedby N-(thioacyl)phthalimidesunder very mild conditions to provide N-(hydroxyethyl)thiosmidesin high yields. CycMehydration with Burgess reagent then provides a-amino acid thiazolines. This approach provides a convenientattereative to those baaed upon rfriort~on of a p~form@fN-(hydroxyethyMride.
📜 SIMILAR VOLUMES
Chiral N-protected p-amino alcohols are easily obtained by NaB& reduction of mixed anhydndes of N-protected a-ammo acids m an organic/aqueous medium. The alcohols obtamed from side chain or main chain reduction of N-protected asparhc acid are converted in good yields into lactones.
In previous papers, l-3 we reported the synthesis of a,S-unsaturated N-acyla-amino acid ester (1) by the condensation of ethyl a-oxocarboxylate with amide or by the treatment of N-acetoxy-N-acyl-a-amino acid ester with Et3N. Up to date,
p. 521, line 9, phthaloyl should be phthalyliminonethyl. p. 521, line 10, propenoate (la) should be butanoate (la). p. 521, line 11, pentenoate (6i) should be buterloate (6a). ## F. 5Z, Table 1, Value of NMR spectrum should be ppm.