Utilizing the efficient preparation of (+)-nonactic acid(2a) and (-)-m
ethyl 8-epi-nonactate (4b) starting from optically active 2-isoxazolin
es 5a and 5b, respectively, the total synthesis of nonactin has been a
ccomplished. Based on the high dilution Version of the Yamaguchi's met
hod, the final macrolactonization has been completed in high yield.