Asymmetric Electrophilic Amination of Various Carbon Nucleophiles with Enantiomerically Pure Chiral <i>N</i>-H Oxaziridines Derived from Camphor and Fenchone
作者:Philip C. Bulman Page、Corinne Limousin、Victor L. Murrell
DOI:10.1021/jo020306j
日期:2002.11.1
The first two stableenantiomericallypure chiral N-H oxaziridines, derivedfrom camphor and fenchone, are shown to act as electrophilic sources of nitrogen upon reaction with various carbon nucleophiles. Nitrogen is transferred, together with the camphor/fenchone unit, when deprotonated esters, malonates, and nitriles are used as nucleophiles. One of the ester or nitrile units in the substrate usually
Silica supported MoO 3 : a mild heterogeneous catalyst for the Beckmann rearrangement and its application to some sugar derived ketoximes
作者:Mohan K. Dongare、Vivekanand V. Bhagwat、C.V. Ramana、Mukund K. Gurjar
DOI:10.1016/j.tetlet.2004.04.068
日期:2004.6
Silica supported molybdenum(VI) oxide (20%) has been explored as a new solid catalyst for the Beckmannrearrangement and the results are compared in parallel with the known β-zeolite as a catalyst for the same transformation. Both catalysts were found to facilitate the rearrangement under mild conditions and the conditions employed were tolerable for protecting groups such as isopropylidene, cyclohexylidene