Isolation of Ciliatamide D from a Marine Sponge Stelletta sp. and a Reinvestigation of the Configuration of Ciliatamide A
摘要:
A new lipopeptide, ciliatamide D (1), was isolated from a marine sponge Stelletta sp., collected at Oshimashinsone, together with the known compound ciliatamide A (2). Ciliatamide D (1) is a congener of 2, in which N-Me-Phe is replaced by N-Me-Met(O). Marfey's analysis of the acid hydrolysate of 1 demonstrated that the two constituent amino acids were both in the L-form. This result prompted us to carefully investigate the configuration of 2, resulting in the assignment of the L-form for both residues.
Ring-closing metathesis based total synthesis of ciliatamides A and B and their structural confirmation
作者:Krishnakumari Avula、Debendra K. Mohapatra
DOI:10.1016/j.tetlet.2016.03.017
日期:2016.4
Protecting group dependant ring-closingmetathesis based approach to the total synthesis of the revised structures of ciliatamides A and B has been described. The current synthetic strategy utilizes the amino acid as starting material to introduce both the stereogenic centers. However, usage of non-racemizing reagents (EDC·HCl, HATU/NMM); for amide coupling and Grubbs’ second generation catalyst for
Total Synthesis of Ciliatamides A-C: Stereochemical Revision and the Natural Product-Guided Synthesis of Unnatural Analogs
作者:Jana A. Lewis、R. Nathan Daniels、Craig W. Lindsley
DOI:10.1021/ol801842v
日期:2008.10.16
The first total synthesis of Ciliatamides A-C was completed, leading to a revision of the reported stereochemistry from (SS) to the (R,R) enantiomers. Due to the expedited route, a library of over 50 unnatural ciliatamide analogs was also prepared.