Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The imine of 2-methylcyclopentanone with (S)-(−)-phenylethylamine was subjected to reaction with methyl propiolate and the product was transformed into (−)-isocuparene by use of a Diels-Alder reaction to construct the aromatic ring. ... (−)-Isocuparene has been ...