Phase-transfer alkylation of diethyl 2-oxopropylphosphonate (9) with 2-iodoalkyl azide afforded 40% of azido phosphonate 6, which underwent a phase-transfer Horner-Emmons Wittig reaction with heptadecanal to provide 80% of azido enone 5. An intramolecular aza-Wittig reaction with polymer-bound Ph3P in toluene at reflux completed the first synthesis of lanopylin B-1 in 76% yield.
KHOUKHI, M.;VAULTIER, M.;CARRIE, R., TETRAHEDRON LETT., 1986, 27, N 9, 1031-1034