M. Cortes et al., Synthesis of (+)-cyclozonarone and the absolute configuration of naturallyoccurring (-)-cyclozonarone, J NAT PROD, 64(3), 2001, pp. 348-349
Synthesis of(+)-cyclozonarone (1) has been achieved using (-)-polygodial(3)
as chiral starting material. The absolute configuration of naturally occur
ring (-)-cyclozonarone was established as 5R,10R by comparison of spectral
data and optical rotation with those of (+)-cyclozonarone.