New Chiral Zwitterionic Phosphorus Heterocycles: Synthesis, Structure, Properties and Application as Chiral Solvating Agents
作者:Andrey E. Sheshenev、Ekaterina V. Boltukhina、Anastasiya A. Grishina、Ivana Cisařova、Ilya M. Lyapkalo、King Kuok Mimi Hii
DOI:10.1002/chem.201300062
日期:2013.6.17
A family of new chiral zwitterionic phosphorus‐containing heterocycles (zPHC) have been derived from methylene‐bridged bis(imidazolines). These structures were unambiguously determined, including single‐crystal XRD analysis for two compounds. The stability, acid/base and electronic properties of these dipolar phosphorusheterocycles were subsequently investigated. zPHCs can be successfully employed
The present invention provides imidazopyridine compounds, compositions containing the same, as well as processes for the preparation and methods for their use as pharmaceutical agents.
The present invention provides imidazopyridine compounds, compositions containing the same, as well as processes for the preparation and methods for their use as pharmaceutical agents.
Stereoselective syntheses of chiral (3S,9bS)-1,2,3,9b-tetrahydro-5H-imidazo[2,1-a]isoindol-5-ones
作者:Alan R. Katritzky、Hai-Ying He、Akhilesh K. Verma
DOI:10.1016/s0957-4166(02)00220-3
日期:2002.6
Chiral (3S,9bS)-1,2,3,9b-tetrahydro-5H-imidazo[2,1-a]isoindol-5-ones 11a-11f, 14b.14c and 17a,b were prepared in 78-93% yields with high stereoselectivities (d.e. >99%) by the intermolecular condensations of 2-formylbenzoic acids 10 or 13 or 2-acetylbenzoic acid 15 with chiral diamines 9a-9f and 9h. Compounds 9a-9f and 9h were readily prepared in three steps from optically active N-Boc-alpha-amino acids 5a-5d. (C) 2002 Elsevier Science Ltd. All rights reserved.