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2016 ; 22
(24
): 8158-66
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English Wikipedia
Discovery, Total Synthesis and Key Structural Elements for the Immunosuppressive
Activity of Cocosolide, a Symmetrical Glycosylated Macrolide Dimer from Marine
Cyanobacteria
#MMPMID27139508
Gunasekera SP
; Li Y
; Ratnayake R
; Luo D
; Lo J
; Reibenspies JH
; Xu Z
; Clare-Salzler MJ
; Ye T
; Paul VJ
; Luesch H
Chemistry
2016[Jun]; 22
(24
): 8158-66
PMID27139508
show ga
A new dimeric macrolide xylopyranoside, cocosolide (1), was isolated from the
marine cyanobacterium preliminarily identified as Symploca sp. from Guam. The
structure was determined by a combination of NMR spectroscopy, HRMS, X-ray
diffraction studies and Mosher's analysis of the base hydrolysis product. Its
carbon skeleton closely resembles that of clavosolides A-D isolated from the
sponge Myriastra clavosa, for which no bioactivity is known. We performed the
first total synthesis of cocosolide (1) along with its [?,?]-anomer (26) and
macrocyclic core (28), thus leading to the confirmation of the structure of
natural 1. The convergent synthesis featured Wadsworth-Emmons cyclopropanation,
Sakurai annulation, Yamaguchi macrocyclization/dimerization reaction, ?-selective
glycosidation and ?-selective glycosidation. Compounds 1 and 26 potently
inhibited IL-2 production in both T-cell receptor dependent and independent
manners. Full activity requires the presence of the sugar moiety as well as the
intact dimeric structure. Cocosolide also suppressed the proliferation of
anti-CD3-stimulated T-cells in a dose-dependent manner.