Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Inorganic Chemistry  (1)
  • enantiomeric resolution  (1)
  • 1
    ISSN: 0947-6539
    Keywords: amino alcohols ; asymmetric syntheses ; chiral auxiliaries ; enantiomeric resolution ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optically active tert-leucinol is an important building block in asymmetric synthesis. However, the (R) enantiomer particularly has so far remained difficult to obtain, mainly because of the laborious synthesis of the precursor amino acid, (R)-tert-leucine. Here we present a new, classical resolution of racemic tert-leucinol, which allows straightforward preparation of each, but especially the (R) enantiomer, in good yields and high optical purities. The feasibility of the synthesis of useful derivatives is demonstrated by transformation into the corresponding (R)-4-tert-butyl-2-oxazolidinone.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 173-189 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Amino Acids, I Syntheses of Amino Acids from Halocarboxylic Alkyl Esters and Alkali Metal Cyanates1)α- and ω-halo- as well as α,ω-dihalocarboxylic alkyl react with potassium cyanate in the presence of alcohol at 80-120°C in dipolar aprotic solvents to yield α- and ω(alkoxycarbonyl-amino)- and α, ω-bis(alkoxycarbonylamino)carboxylic alkyl esters, respectively, in good yields. Hydrolytic cleavage of these mono- or diurethanes with an aqueous solution of hydrochloric acid/formic acid leads to the corresponding amino acid hydrochlorides in nearly quantitative yields.
    Notes: α- und ω-Halogen- sowie α,ω-Dihalogencarbonsäure-alkylester reagieren mit Kaliumcyanat in Gegenwart von Alkoholen in dipolaren aprotischen Lösungsmitteln bei 80-120°C in guten Ausbeuten zu α- und ω-(Alkoxycarbonylamino)- bzw. α,ω-Bis(alkoxycarbonylamino)carbonsäurealkylestern (Mono- bzw. Diuerthane). Die hydrolytische Spaltung dieser Verbindungen mit einem wäßrigen Salzsäure/Ameisensäure-Gemisch führt in meist quantitativen Ausbeuten zu den entsprechenden Aminosäure-hydrochloriden.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...