Enantioselective tandem formation and [2,3]‐sigmatropic rearrangement of cyclic propargylic oxonium ylides catalyzed by dirhodium(II) tetrakis[<i>N</i>‐phthaloyl‐(<i>S</i>)‐<i>tert</i>‐leucinate]
作者:Hideyuki Tsutsui、Maya Matsuura、Kazuishi Makino、Seiichi Nakamura、Makoto Nakajima、Shinji Kitagaki、Shunichi Hashimoto
DOI:10.1560/e7m9-em8u-tp1b-41hb
日期:2001.12
rearrangement of propargylic oxonium ylides generated by catalytic diazo decomposition. Catalysis of α-diazo-ß-keto esters 4a—g using dirhodium(II) tetrakis[N-phthaloyl-(S)-tert-leucinate] in toluene has led to the virtually exclusive formation of benzofuran-3-ones bearing an allenic group with up to 79% ee.
本文描述了催化重氮分解产生的炔丙基氧鎓叶立德的环选择性[2,3]-σ重排的催化剂依赖性不对称诱导的第一个例子。在甲苯中使用四[二[ N-邻苯二甲酰基- (S)-叔-亮氨酸酯]]吡啶鎓(II)催化α-重氮-β-酮酸酯4a-g导致几乎完全形成带有烯丙基的苯并呋喃-3-酮ee最高可达79%。