Convenient method for the kinetic resolution of β-aminoalcohols
作者:Béatrice Pelotier、Ghislaine Priem、Simon J.F. Macdonald、Mike S. Anson、Richard J. Upton、Ian B. Campbell
DOI:10.1016/j.tetlet.2005.10.111
日期:2005.12
A variety of easily removable protecting groups were tested in the kinetic resolution of N-protected beta-aminoalcohols using chiral catalysts derived from N-4'-pyridinyl-alpha-methyl proline. The trifluoroacetyl group was the most promising protecting group as it gave the highest selectivities with all alcohols tested and can easily be removed without loss of enantiomeric excess. This strategy constitutes a convenient method for the kinetic resolution of beta-aminoalcohols. (c) 2005 Elsevier Ltd. All rights reserved.
The Role of the Amino Protecting Group during Parahydrogenation of Protected Dehydroamino Acids
A series of dehydroamino acids endowed with different protective groups at the amino and carboxylate moieties and with different substituents at the double bond have been reacted with parahydrogen. The observed ParaHydrogen Induced Polarization (PHIP) effects in the 1H NMR spectra are strongly dependent on the aminoprotectinggroup. DFT calculations allowed us to establish a relationship between the
使在氨基和羧酸酯部分具有不同保护基并且在双键具有不同取代基的一系列脱氢氨基酸与对氢反应。在1 H NMR光谱中观察到的副氢诱导极化(PHIP)效应强烈依赖于氨基保护基。DFT计算使我们能够建立反应中间体的结构(其能量取决于酰胺取代基)与观察到的PHIP模式之间的关系。