Stereoselective syntheses of malyngamide X (1) and its 7'(S)-epimer are described. A Lewis acid (Et2AlCl) mediated anti-aldol reaction was employed to generate the stereocenters C-7 and C-8. The route is convergent and provides a convenient access to the synthesis of structural variants of malyngamide X. Stereochemistry at C-7' in the molecules of natural and synthetic 1, and 7'(S)-epi 1 was confirmed by NMR chiral solvation experiments. (c) 2007 Elsevier Ltd. All rights reserved.
Efficient Total Synthesis of Dysidenin, Dysidin, and Barbamide
作者:Elizabeth A. Ilardi、Armen Zakarian
DOI:10.1002/asia.201100338
日期:2011.9.5
The total syntheses of three trichloroleucine‐derived marine natural products—dysidenin, dysidin, and barbamide—capitalized on a practical and highly diastereoselective ruthenium catalyzed radical chloroalkylation of N‐acyloxazolidinones as the key step.