Amine-Free Approach toward<i>N</i>-Toluenesulfonyl Amidine Construction: A Phosphite-Mediated Beckmann-Like Coupling of Oximes and<i>p</i>-Toluenesulfonyl Azide
作者:Lauren M. Fleury、Erin E. Wilson、Monika Vogt、Tiffany J. Fan、Allen G. Oliver、Brandon L. Ashfeld
DOI:10.1002/anie.201305141
日期:2013.10.25
Atom hopping: A chlorophosphite‐mediated Beckmann ligation of oximes and p‐toluenesulfonyl azide gives access to N‐sulfonyl phosphoramidines in good to excellent yields. The reaction proceeds under exceptionally mild conditions and constitutes a bioorthogonal approach toward amidines by avoiding the use of amines and transition‐metal catalysts. dmp‐ol=3,3‐dimethylpropanediol.
Synthesis of <i>C</i><sub>1</sub>-Symmetric Chiral Secondary Diamines and Their Applications in the Asymmetric Copper(II)-Catalyzed Henry (Nitroaldol) Reactions
作者:Yirong Zhou、Junfang Dong、Fanglin Zhang、Yuefa Gong
DOI:10.1021/jo102124d
日期:2011.1.21
A small library of C1-symmetric chiral diamines (L1−L9) was constructed via condensing exo-(−)-bornylamine or (+)-(1S,2S,5R)-menthylamine with various Cbz-protected amino acids. Among them, ligand L1/CuCl2·2H2O complex (2.5 mol %) shows outstanding catalytic efficiency for Henryreaction between a variety of aldehydes and nitroalkanes to afford the expected products in high yields (up to 98%) with
Synthesis and Characterization of Enantiomerically Pure Menthylamines and Their Isocyanates
作者:Siegfried R. Waldvogel、Matthias C. Schopohl、Klaus Bergander、Olga Kataeva、Roland Fröhlich
DOI:10.1055/s-2003-42432
日期:——
A synthetic protocol for optically pure (-)-menthylamine, (-)-8-methylmenthylamine, and the novel (-)-8-phenylmenthylamine is presented including a detailed characterization of these compounds and their isocyanates.
<i>O</i>-Alkylation of Menthone Oxime: Synthesis and <sup>13</sup>C NMR Studies of a Series of Novel Oxime Ethers
作者:Saqib Faisal、Amina F. Basha、Hina Siddiqui、Fatima Z. Basha
DOI:10.1080/00397910903370691
日期:2010.9.20
menthone oxime ethers were synthesized in three steps starting from (–)-menthol. Analysis of the 13C NMRchemical shift differences between α carbons of oxime derivatives (O-alkyl oximes) provides a convenient and reliable means of assigning oxime stereochemistry. It has been found that carbons syn to the oxime are shifted more upfield than carbons anti to the oximemoiety. Significant E products were