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A convergent synthetic route to the FGHI ring system of yessotoxin, a marine ladder polyether, has been developed. The synthesis features convergent coupling of the diol and the aldehyde to form α-cyano ethers via acetal formation followed by ring closing metathesis and reductive etherification to construct the oxocane ring G and tetrahydropyran ring H, respectively. The β-methyl group on the G ring...
An efficient synthesis of (+)-α-conhydrine 1 and (−)-β-conhydrine 2 has been achieved by diastereoselective alkylation of an amino aldehyde derivative 7 with ethylmagnesium bromide or diethylzinc.
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