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. ... A synthetic route to (+)-1 commencing from (S)-malic acid and 20 is reported. Key steps are the coupling of 20 and 15 to give 21, an intramolecular Wittig reaction (25-→27), and an oxidative cyclization (28-→1). ... A synthetic route from 3 to the known (+)-strigol precursor 1 via 15 ...