A stereocontrolled synthesis of the hydrophobic moiety of rhamnolipids
摘要:
A new approach toward the synthesis of the hydrophobic moiety of rhamnolipid derivatives has been developed, involving two key cross-metatheses and an unusual Mitsunobu reaction. Small structural variations of the side chains should enable a better understanding of the role of the lipid moiety in immunostimulatory and plant defense eliciting properties. (C) 2015 Elsevier Ltd. All rights reserved.
An unusual recycling Mitsunobu reaction proved to be successful to couple two fragments in the course of the synthesis of the hydrophobic moiety of rhamnolipid derivatives. Based on the obtained pivotal intermediate, a one pot ‘cross-metathesis/reduction’ approach gave access to structural variations of the side chains. Further study of these molecules will contribute to a better understanding of the
Study on fungitoxic 3-amino-2-piperidinone-containing lipids: Revised structure of cepaciamide A and structural determination of its closely related lipid, cepaciamide B
The structure of cepaciamide A was revised to be (3R,3'S,2"S,11"S,12"R)-3-[3'-(2"-hydroxy-11", 12"-methyleneoctadecanoyloxy)hexadecamido]-2-piperidinone with respect to the absolute configuration of the C-3'- and C-2"-positions and the position of the cyclopropane ring by using synthetic methods. The structure of cepaciamide B was also determined to be (3R,3'S,2"S,11"Z)-3-[3'-(2"-hydroxy-11"-octadecenoyloxy)hexadecamido]-2-piperidinone. (C) 1999 Elsevier Science Ltd. All rights reserved.