作者:Xiao-Wei Liang、Xiaoling Chen、Zhiguo Zhang、Shu-Li You
DOI:10.1016/j.cclet.2018.01.039
日期:2018.8
Abstract A catalytic asymmetric brominative dearomatization reaction of benzofuran derivatives was achieved by using hydroquinidine 1,4-phthalazinediyl diether [(DHQ)2PHAL] as the catalyst and N-bromoacetamide (NBAc) as the brominating reagent. A series of brominated spiro[benzofuran-2,5'-oxazoles] bearing two contiguous stereogenic centers were obtained in high yields (up to 99%) with excellent enantioselectivity
摘要以对苯二酚1,4-酞嗪二基二醚[(DHQ)2PHAL]为催化剂,以N-溴乙酰胺(NBAc)为溴化剂,实现了苯并呋喃衍生物的催化不对称溴化脱芳香化反应。以高收率(最高达99%)和极好的对映选择性(最高达97%ee)获得了一系列带有两个连续立体中心的溴化螺[苯并呋喃-2,5'-恶唑]。