Asymmetric synthesis of (R)-hexane-1,5-diol, (R)-hex-3-ene-1,5-diol and (R)-6-methylhept-5-en-2-ol (sulcatol) employing a tandem asymmetric conjugate addition and stereospecific Meisenheimer rearrangement protocol
作者:Stephen G. Davies、G. Darren Smyth
DOI:10.1039/p19960002467
日期:——
Highly stereoselective conjugate addition of lithium (R)-N-methyl-(α-methylbenzyl)amide to tert-butyl (E,E)-hexa-2,4-dienoate, followed by reduction of the ester to the corresponding alcohol, affords a substrate which undergoes, upon oxidation, a stereospecific Meisenheimer rearrangement to give a single diastereomer of the corresponding trialkylhydroxylamine. The analogous N-benzyl adduct gives lower
Enantioselective synthesis of primary amines via Grignard additions to stereogenic N-(.alpha.-phenyl-.beta.-(benzyloxy)ethyl)nitrones
作者:Zen Yu Chang、Robert M. Coates
DOI:10.1021/jo00298a019
日期:1990.5
Totally Stereocontrolled Nitrone−Ketene Acetal Based Synthesis of (2<i>S</i>,3<i>S</i>)-<i>N</i>-Benzoyl- and <i>N</i>-Boc-phenylisoserine
作者:Sylvie Jost、Yves Gimbert、Andrew E. Greene、Frédéric Fotiadu
DOI:10.1021/jo971009v
日期:1997.9.1
A novel, nitrone-ketene acetal based approach to enantiopure (2S,3S)-N-benzoyl- and N-boc-phenylisoserine has been realized. The convergent approach, which involves the intermediacy of isoxazolidinones, proceeds in up to 59% overall yield and requires only three operations from the starting nitrones.
Keirs, David; Moffat, David; Overton, Karl, Journal of the Chemical Society. Perkin transactions I, 1991, # 5, p. 1041 - 1051
作者:Keirs, David、Moffat, David、Overton, Karl、Tomanek, Richard
DOI:——
日期:——
Catalytic Oxidation of Imines Based on Methyltrioxorhenium/Urea Hydrogen Peroxide: A Mild and Easy Chemo- and Regioselective Entry to Nitrones
[reaction: see text] The first successful catalytic oxidation procedure for the chemoselective conversion of imines to nitrones is reported. The reaction is general, high yielding, and user and environmentally friendly, and furnishes a solution to the yet unanswered issue of regioselective access to nitrones by oxidation of nitrogen derivatives.