A. Morohashi et al., Absolute configuration at C45 in 45-hydroxyyessotoxin, a marine polyether toxin isolated from shellfish, BIOS BIOT B, 64(8), 2000, pp. 1761-1763
The marine polyether toxin, 45-hydroxyyessotoxin, was Isolated together wit
h yessotoxin from the scallop, Patinopecten yessoensis. The 45-hydroxy grou
p in the gide chain was esterified with (S)- and (R)-alpha-methoxy-alpha-tr
ifluoromethylphenylacetic acids (MTPA). A detailed analysis of the 2D NMR s
pectra of the two esters established the R configuration at C45.