General Strategy for Large-Scale Synthesis of (+)-Rivastigmine and (+)-NPS R-568
摘要:
An economically viable strategy for the total synthesis of (+)-rivastigmine and (+)-NPS R-568 has been reported. The strategy involves regioselective hydrogenation of diastereomerically pure bis amine to realize the desired alpha-methyl chiral substituted benzyl amine. The route is economical, scalable, and versatile enough to be adapted to similar classes of compounds.
A practical and efficient synthesis of (E)-β-aryl-α,β-unsaturated amides
作者:Chih-Ching Chen、Jung-Chieh Ho、Nein-Chen Chang
DOI:10.1016/j.tet.2008.08.057
日期:2008.11
In this paper, we report a one-step convergent synthesis of (E)-β-monosubstituted α,β-unsaturatedamides 3 from α-sulfonyl acetamide 1 and benzyl bromide derivatives 2.
<i>N</i>-Isopropylsulfinylimines as Useful Intermediates in the Synthesis of Chiral Amines: Expeditive Asymmetric Synthesis of the Calcimimetic (+)-NPS R-568
An efficient and high-yielding approach for the asymmetricsynthesis of calcimimetic (+)-NPS R-568 (1) has been developed. The key step of the synthesis is the highly diastereoselective addition of methyl Grignard to the (SS,E)-N-(3-methoxybenzylidene)-2-propanesulfinamide [5(S)], which afforded a single diastereoisomer in high yield in short reaction time
An economically viable strategy for the total synthesis of (+)-rivastigmine and (+)-NPS R-568 has been reported. The strategy involves regioselective hydrogenation of diastereomerically pure bis amine to realize the desired alpha-methyl chiral substituted benzyl amine. The route is economical, scalable, and versatile enough to be adapted to similar classes of compounds.