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
研究了由AgOTf促进的1-溴-9-叔丁基二苯基二甲硅烷氧基-4,5,7,8-双环氧壬烷的一锅连续扩环反应。该顺反式-衍生物在干CH与处理的AgOTf 2氯2给予顺-融合perhydrotriflyloxypyranopyran为主要产品。另一方面,在相同条件下,将相应的反-反异构体转化为顺式融合的全氢三氟乙氧基吡喃呋喃。