New synthesis of Evans chiral oxazolidinones by using Sharpless AA reaction
作者:Guigen Li、Robert Lenington、Steven Willis、Sun Hee Kim
DOI:10.1039/a801404c
日期:——
Optically pure new Evans auxiliary analogs, (4R)- and (4S)-4-(2-naphthyl)oxazolidin-2-one, have been synthesized by using the Sharpless catalytic asymmetric aminohydroxylation reaction (Sharpless AA). The concise two-step synthesis involves a unique solution-to-solid Sharpless AA process and new neat cyclization conditions.
Cinchona alkaloid ester derivatives as ligands in the asymmetric dihydroxylation and aminohydroxylation of alkenes
作者:Hui Chen、Qiao Feng Wang、Xiao Li Sun、Jing Luo、Ru Jiang
DOI:10.1016/j.mencom.2010.03.013
日期:2010.3
Cinchona alkaloid ester derivatives were adopted to asymmetric dihydroxylation and asymmetric aminohydroxylation reactions in excellent yields and enantiomeric excesses.
Li, Guigen; Angert, Hubert H.; Sharpless, K. Barry, Angewandte Chemie, 1996, vol. 108, # 23/24, p. 2995 - 2999
作者:Li, Guigen、Angert, Hubert H.、Sharpless, K. Barry
DOI:——
日期:——
4-Naphthyl-substituted bis(oxazoline): A new, easily recoverable and efficient chiral ligand in asymmetric catalysis of the Diels-Alder reaction
analysis. These new bis(oxazolines) are efficient chiralligands in the asymmetriccatalysis of the Diels-Alder reaction ofN-alkenoyl-oxazolidin-2-one derivatives since endo cycloadducts are obtained with up to 94% ee. Different Lewis acids were tested, the best one being the Mg(II) cation derived from the corresponding triflate. A remarkable feature of such new chiralligands is the low solubility in