Jr. Mahajan et Is. Resck, SYNTHESIS OF (+ -)-RECIFEIOLIDE AND ITS HOMOLOGS VIA ACETYLENIC LACTONES/, Synthetic communications, 26(20), 1996, pp. 3809-3819
The title compounds (7c,d) have been prepared by the Z to E isomerizat
ion (NaNO2, HNO3) of the corresponding Z-lactones (6c,d), which are st
ereoselectively available (H-2, Lindlar cat.) from the acetylenic lact
ones 4a-d, prepared earlier from cycloalkanones.