A short and efficient synthesis of (+)-spirolaxine methylether, a metabolite of the fungus Sporotrichum laxum with inhibitory activity against Helicobacter pylori, is described. The synthesis has been carried out by a Prins cyclization, to obtain the [6,5]-spiroketal system, and a Wadsworth−Emmons condensation, applied for the installation of the polymethylene chain on the phthalide moiety.
A Practical Total Synthesis of (+)-Spirolaxine Methyl Ether
作者:J. S. Yadav、M. Sreenivas、A. Srinivas Reddy、B. V. Subba Reddy
DOI:10.1021/jo1016647
日期:2010.12.3
An efficient and practical total synthesis of (+)-spirolaxine methylether is described. The phthalide-aldehyde 3 has been prepared via the Diels−Alder reaction between 1,4-unconjugated diene 5 and a long-chain acetylenic dienophile 6. The carbon framework of spiroketal sulfone 4 has been constructed from monobenzyl protected 1,5-pentanediol and the stereochemistry in both the phthalide portion and
Synthesis of the anti-Helicobacter pylori agent (+)-spirolaxine methyl ether and the unnatural (2″S)-diastereomer
作者:James E. Robinson、Margaret A. Brimble
DOI:10.1039/b708265g
日期:——
The first enantioselective synthesis of the anti-Heliocbacter pylori agent (+)-spirolaxinemethylether 2b has been carried out in a convergent fashion establishing that the absolute stereochemistry of the naturalproduct is in fact (3R, 2"R, 5"R, 7"R) after initial synthesis of the unnatural (2"S)-diastereomer 2a. The key step in the synthesis of (+)-spirolaxinemethylether 2b involved a heterocycle-activated
A Cyclopropanol-Based Strategy for Subunit Coupling: Total Synthesis of (+)-Spirolaxine Methyl Ether
作者:Katie A. Keaton、Andrew J. Phillips
DOI:10.1021/ol0710111
日期:2007.7.1
A strategy for ketone synthesis with cyclopropanols as intermediates and its application to (+)-spirolaxine methyl ether is described. The synthesis also features an application of Fu's alkyl-alkyl Suzuki coupling.