The biomimetic construction of fused cyclic polyethers
摘要:
The formation of fused cyclic ethers by biomimetic synthesis was demonstrated. The one-pot successive ring-expansion reactions of bromo diepoxides were investigated by regarding the epoxy groups as the nucleophiles for the intramolecular cationic carbons to obtain the fused cyclic ethers. (C) 1997 Elsevier Science Ltd.
The biomimetic construction of fused cyclic polyethers
摘要:
The formation of fused cyclic ethers by biomimetic synthesis was demonstrated. The one-pot successive ring-expansion reactions of bromo diepoxides were investigated by regarding the epoxy groups as the nucleophiles for the intramolecular cationic carbons to obtain the fused cyclic ethers. (C) 1997 Elsevier Science Ltd.
Fused cyclic ether formations from bromo-diepoxides by AgOTf-promoted successive ring expansion reactions
作者:Nobuyuki Hayashi、Kenshu Fujiwara、Akio Murai
DOI:10.1016/0040-4039(96)01340-8
日期:1996.8
The one-pot successive ring expansion reactions of 1-bromo-9-tert-butyldiphenylsilyloxy-4,5,7,8-diepoxynonanes promoted by AgOTf were investigated. The syn-trans-derivative was treated with AgOTf in dry CH2Cl2 to give the cis-fused perhydrotriflyloxypyranopyran as the major product. On the other hand, the corresonding anti-trans-isomer was transformed into the cis-fused perhydrotriflyloxypyranofuran