The syntheses of L(+) and D(−) enantiomers of α-amino acids, norvaline, norleucine, and leucine, as their hydrochloride salts have been achieved in almost 100% optical purity and 40–60% overall yield.
lodonium nitrate in pyridine-chloroform at room temperature undergoes preferential electrophilic addition to certain olefinic alcohols to form (i) hydroxyiodoalkyl nitrates and (ii) hydroxyiodoalkylpyridinium nitrates. Parallel reactions in sym-collidine-chloroform gave three-, four-, and five-membered cyclic ethers as well as products of type
Durch Reaktion der D(+)‐ oder L(‐)‐Form des Amins (I) mit den Aldehyden (II) werden die Schiffschen Basen (III) erhalten, die HCN addieren unter Bil‐ L dung von nur einem Diastereomeren der Aminonitrile (IV).
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