Carbene‐Catalyzed Dynamic Kinetic Resolution and Asymmetric Acylation of Hydroxyphthalides and Related Natural Products
作者:Yingguo Liu、Pankaj Kumar Majhi、Runjiang Song、Chengli Mou、Lin Hao、Huifang Chai、Zhichao Jin、Yonggui Robin Chi
DOI:10.1002/anie.201912926
日期:2020.3.2
A catalytic dynamic kinetic resolution and asymmetric acylation reaction of hydroxyphthalides is developed. The reaction involves formation of a carbene catalyst derived chiral acyl azoliumintermediate that effectively differentiates the two enantiomers of racemic hydroxyphthalides. The method allows quick access to enantiomerically enriched phthalidyl esters with proven applications in medicine.
Syntheses of 5-, 7-, and 8-methoxy-3-methyl-2-tetralones
作者:Anette M. Johansson、Charlotta Mellin、Uli Hacksell
DOI:10.1021/jo00376a038
日期:1986.12
An Organic White Light-Emitting Fluorophore
作者:Youjun Yang、Mark Lowry、Corin M. Schowalter、Sayo O. Fakayode、Jorge O. Escobedo、Xiangyang Xu、Huating Zhang、Timothy J. Jensen、Frank R. Fronczek、Isiah M. Warner、Robert M. Strongin
DOI:10.1021/ja0632207
日期:2006.11.1
The synthesis of new benzo[a]- and [b] xanthene dye frameworks is described. A unique benzo[a] xanthene, seminaphtho[a] fluorone (SNAFR-1), is studied in a variety of media. The optimization of solution parameters and excitation wavelengths allows SNAFR-1 to display red, green, and blue emission bands of approximately equal intensities and also to produce white light. Ratiometric red (anion) and green (neutral) emissions are observed upon varying solution pH. A pH-independent violet-blue emission band is due to the addition of nucleophiles to the benzylic carbon of SNAFR-1.
JOHANSSON A. M.; MELLIN CH.; HACKSELL U., J. ORG. CHEM., 51,(1986) N 26, 5252-5258