Novel Cuticular Hydrocarbons from the Cane Beetle <i>Antitrogus parvulus</i>4,6,8,10,16-Penta- and 4,6,8,10,16,18-HexamethyldocosanesUnprecedented <i>anti-anti-anti</i>-Stereochemistry in the 4,6,8,10-Methyltetrad
作者:Sharon Chow、Mary T. Fletcher、Lynette K. Lambert、Oliver P. Gallagher、Christopher J. Moore、Bronwen W. Cribb、Peter G. Allsopp、William Kitching
DOI:10.1021/jo0481093
日期:2005.3.1
[GRAPHICS]The major cuticular hydrocarbons from the cane beetle species Antitrogus parvulus are 4,6,8,10,16-penta- and 4,6,8,10,16,18-hexamethyldocosanes, I and 2, respectively. Stereoisomers of 2,4,6,8-tetramethylundecanal of established relative stereochemistry were derived from 2,4,6-trimethylphenol and were then coupled with appropriate methyl-substituted phosphoranes 62 and 25 to furnish alkenes, which on reduction provided diastereomers of I and 2, respectively. Capillary gas chromatography, mass spectrometry, and high resolution C-13 NMR spectroscopy confirmed 1 as either 84a or 84b and 2 as either 15a or 15b. The novelty of these structures and their relative stereochemistry is briefly related to polyketide assembly.