## Abstract 2‐Imino‐1,3,4‐oxdiazoline reagieren mit Carbazinsäureäthylester zu 1‐Acyl‐2‐alkyl‐5‐carbäthoxy‐diaminoguanidinen, die sich in Abhängigkeit vom pH‐Wert zu zwei verschiedenen 1,2,4‐Triazol‐Derivaten cyclisieren lassen.
Herstellung enantiomerenreiner Derivate von 3-Amino- und 3-Mercaptobuttersäure durch SN2-Ringöffnung des β-Lactons und eines 1,3-Dixoanons aus der 3-Hydroxybuttersä ure
✍ Scribed by Axel Griesbeck; Dieter Seebach
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- German
- Weight
- 417 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
From (S)-4-methyloxetan-2-one (l), the b-butyrolactone readily available from the biopolymer (R)-polyhydroxybutyrate (PHB) and various C,N,O and S nucleophiles, the following compounds are prepared: (S)-2-hydroxy-4-octdnone (3), (R)-3-aminobutanoic acid (7) and its N-benzyl derivative 5, (R)-3-azidobutanoic acid (6), (R)-3-mercaptobutdnoic acid (lo), (R)-3-(phenylthio)butdnoic acid (8) and its sulfoxide 9. The (6R)-2,6-dimethyl-2-ethoxy-1.3-dioxan-4-one (4) from (R)-3-hydroxybutanoic acid undergoes SN2 ring opening with benzylamine to give the N-benzyl derivative (enj-5) of (S)-3-aminobutanoic acid in 3040% yield.
📜 SIMILAR VOLUMES