Department of Biology and Physical Sciences, Marymount University, Arlington, Virginia 22207, USA.
Org Lett. 2012 Apr 6;14(7):1676-9. doi: 10.1021/ol300213u. Epub 2012 Mar 12.
The axial-equatorial conformational isomer distribution of the reactant diazoacetoacetate or its metal carbene intermediate is reflected in Rh(II) catalyzed oxonium ylide forming reactions of 3-(trans-2-arylvinyl)tetrahydropyranone-5-diazoacetoacetates that afford diastereoisomeric products for both the symmetry-allowed [2,3]- and the formally symmetry-forbidden [1,2]-oxonium ylide rearrangements.
反应物重氮乙酰乙酸或其金属卡宾中间体的轴向-赤道构象异构体分布反映在 Rh(II)催化的氧鎓叶立德形成反应中,该反应涉及 3-(反式-2-芳基乙烯基)四氢吡喃酮-5-重氮乙酰乙酸酯,对于对称允许的[2,3]-和形式上对称禁止的[1,2]-氧鎓叶立德重排,都提供了非对映异构体产物。