Total Synthesis of (−)-Zampanolide and Questionable Existence of (−)-Dactylolide as the Elusive Biosynthetic Precursor of (−)-Zampanolide in an Okinawan Sponge
作者:Jun’ichi Uenishi、Takuya Iwamoto、Junichi Tanaka
DOI:10.1021/ol901167g
日期:2009.8.6
concise totalsynthesis of (−)-zampanolide, (−)-1, and (−)-dactylolide, (−)-2, is described. Synthetic highlights include (i) a mild Horner-Wadsworth-Emmons reaction providing the seco acid, (ii) an unusual stepwise cross-coupling reaction of a 1,1-dibromodiene with inversion of olefin geometry, and (iii) specific O-Michael reaction conditions using catalytic LHMDS with TMEDA for the synthesis of functionalized