Studied directed toward the synthesis of phomenoic acid. Part 2. Stereocontrolled synthesis of the C(7)-to-C(14) segment

Article abstract of DOI:10.1002/hlca.19960790219

Starting from the esters (2E,4S)-6 and (2E,4R)-6, bromo aldehydes (S)-9 and (R)-9 as well as bromo alcohols (S)-10 and (R)-10, respectively, were prepared. Bromo alcohol (R)-8 was converted to the diol (2E,4R)-16. Ozonolysis of the latter led to aldehyde (R)-17, which was transformed, by a Wittig reaction, to (2R,4E,6R)-18, corresponding to the C(7)-to-C(14) segment of phomenoic acid (1). Attempts to improve the yields by applying a Julia coupling of (R)-23, which was prepared from (2E,4R)-7, with (R)-24 were unsuccessful. Finally, the coupling of the iodo derivative (2E,4S)-28 with the lithiated derivative of 1,3-dithiane 30 by the Gorey-Seebach 'Umpolung' led to (3S,4E)-32 which is a derivative of the C(7)-to-C(14) segment of 1, suitable for further transformations.