We report here a short approach to a tricyclic substructure of tetrodecamyc
in exhibiting a unique ring skeleton utilising an acid catalysed ring closu
re as the key step. In addition an efficient three-step synthesis of 5-alky
lidene 4-methoxy-2(5H)-furanones starting from 4-methoxy-2(5H)-furanone is
described. (C) 2000 Elsevier Science Ltd. All rights reserved.