Novel naturally occurring α-methoxy acids from the phospholipids of caribbean sponges1
作者:Néstor M. Carballeira、Vilmary Negrón、Elba D. Reyes
DOI:10.1016/s0040-4020(01)88201-6
日期:1992.1
The novel very long chain (5Z,9Z)-2-methoxy-5,9-hexacosadienoic acid (1) was identified in the phospholipids of the Caribbean sponge Tropsentia roquensis. The new acid (5Z)-2-methoxy-5-hexadecenoic acid (2) was also identified in the phospholipids of the sponge Mycale laxissima while the acid (6Z)-2-methoxy-6-hexadecenoic acid (3) was found to be present in the phospholipids of the Caribbean sponge Spheciospongia cuspidifera.. The double bond positions in the monounsatutared acids were determined by GC/MS on the corresponding dimethyldisulfide adducts and the double bond stereochemistry was elucidated by GC/FTIR. These fatty acids were found in phosphatidylethanolamine.
Facile Total Synthesis and Antimicrobial Activity of the Marine Fatty Acids (<i>Z</i>)-2-Methoxy-5-hexadecenoic Acid and (<i>Z</i>)-2-Methoxy-6-hexadecenoic Acid
作者:Néstor M. Carballeira、Anastacio Emiliano、Norali Hernández-Alonso、Fernando A. González
DOI:10.1021/np980274o
日期:1998.12.1
The totalsynthesis of the naturallyoccurring (Z)-2-methoxy-5-hexadecenoic acid and (Z)-2-methoxy-6-hexadecenoic acid was accomplished using as a key step Mukaiyama's trimethylsilyl cyanide addition to 4- and 5-pentadecenal, respectively. These syntheses further confirm the structures of the natural marine fatty acids and corroborate their cis double-bond stereochemistry. The title compounds were