Total synthesis of motualevic acids A–F, (E) and (Z)-antazirines
摘要:
Total synthesis of motualevic acids A-F and (E) & (Z) geometrical isomers of antazirines has been achieved from a commercially available starting material, 1,10-decanediol. The synthesis of motualevic acid E served as a common key intermediate for the synthesis of most of these natural products. The key steps involved in this synthesis were Wittig olefination, Corey-Fuchs reaction, Neber reaction, amide coupling. (C) 2014 Elsevier Ltd. All rights reserved.
A fluorescence-labeled calix[4]arene library substituted with peptides at the upperrim was synthesized. Screening of the library for binding a dye-labeled oligopeptide indicated that some peptidocalix[4]arenes selectively bind the oligopeptide. The chemosensitivity of the library members for a target peptide was also investigated.
V-MPS4 catalyst was reusable up to six times without a significant loss in the product yield. The advantages of using the heterogeneous catalyst were further demonstrated by conducting the deprotection reaction in a continuous flow process, which resulted in a 2.7-fold higher catalyst turnover number and 60-fold higher turnover frequency compared to those of the corresponding batch reaction. Fullsize