First stereoselective synthesis of potassium aeschynomate and its no-natural stereomers
摘要:
The synthesis of potassium aeshynomate and its non-natural stereomers was achieved using the Sharpless catalytic asymmetric dihydroxylation of (Z) or (E) vinylogous glycine as the key step. The resulting gamma-amino alpha, beta-dihydroxyester stereomer was deprotected and coupled with the caffeic acid to afford stereoselectively potassium aeshynomate or its stereomers. A detailed study of the NMR data of the different stereomers is reported that corrects the literature data. (c) 2005 Elsevier Ltd. All rights reserved.
Total Synthesis of Enantiopure Potassium Aeshynomate
摘要:
Potassium aeshynomate (1) is the leaf-opening factor of the nyctinastic plant Aeshynomene indica L. In this article a convenient and efficient strategy for the total synthesis of enantiomerically pure 1 is described, starting from the L-arabinose derived chiron ent-6. The realized synthetic scheme involves a postcoupling oxidation approach and securely determines the absolute configuration of the targeted natural product, which remained unknown until now.