Convenient Synthesis of meso-Cyclohexa-1,3-dienes by One-Pot Two-Step Deoxygenation of 7-Oxabicyclo[2.2.1]hept-2-enes
作者:Ryo Irie、Tomotsugu Yano、Takashi Fujishima
DOI:10.1055/s-0029-1218618
日期:2010.3
Iron(III) hydroxide oxide was found to be an efficient catalyst for the ring-opening reaction of 5,6-cis-disubstituted 7-oxabicyclo[2.2.1]hept-2-enes with acetyl bromide in dichloromethane at room temperature to give cyclohexene derivatives with leaving groups (acetoxy or bromo groups) disposed on each allylic position. A successive one-pot treatment of the reaction mixture with zinc powder and tetrahydrofuran
发现氢氧化铁(III)是5,6-顺式二取代的7-氧杂双环[2.2.1]庚-2-烯与乙酰溴在室温下在二氯甲烷中进行开环反应的有效催化剂,得到在每个烯丙基位置上带有离去基团(乙酰氧基或溴基)的环己烯衍生物。用锌粉和四氢呋喃对反应混合物进行连续的一锅法处理成功地诱导了还原性1,4-消除,以高到高的产率提供了合成上有用的5,6-二取代的内消旋-环己-1,3-二烯。 催化-开环-呋喃-还原-消除-环己二烯