Synthesis of Novel Chiral Thioether Ligands Containing Imidazole Rings Based on Natural Amino Acids
作者:Pu Mao、Yajing Cai、Yongmei Xiao、Liangru Yang、Yuan Xue、Maoping Song
DOI:10.1080/10426501003671460
日期:2010.11.23
Using commercially available natural aminoacids (L-Val, L-Leu, L-Phe) as chiral precursors, a series of N-substituted imidazole derivatives containingchiral groups was synthesized from the condensation reaction of aminoacids, formaldehyde, glyoxal, and ammonia. Through esterification, reduction, chlorination, and subsequent substitution by thiols, chiral thioethers containing imidazole rings were
以市售天然氨基酸(L-Val、L-Leu、L-Phe)为手性前体,通过氨基酸、甲醛、乙二醛、氨的缩合反应合成了一系列含有手性基团的N-取代咪唑衍生物. 通过酯化、还原、氯化以及随后的硫醇取代,合成了含有咪唑环的手性硫醚,并优化了合成条件。所有中间体和最终产物均通过 NMR、ESI MS、HR MS 和 IR 进行表征。
Synthesis of new chiral imidazolium salts derived from amino acids: their evaluation in chiral molecular recognition
作者:Belén Altava、Dalgi S. Barbosa、M. Isabel Burguete、Jorge Escorihuela、Santiago V. Luis
DOI:10.1016/j.tetasy.2009.03.028
日期:2009.5
A family of new imidazolium salts derivedfrom natural amino acids has been synthesized and tested for NMR enantiodiscrimination, as chiral shift reagents, of carboxylic acids. These imidazolium receptors contain different structural modifications and the splitting of the signals of the acids, after addition of the corresponding CSRs, depends on these structural variables. Compound 8b exhibited the
Chiral bisimidazolium salts derived from amino acids and their palladium(II)- and platinum(II)-biscarbene complexes
作者:Anke Meyer、Maria A. Taige、Thomas Strassner
DOI:10.1016/j.jorganchem.2009.01.036
日期:2009.5
good yields via a one-pot ring closing reaction, followed by esterification. The methylene bridged bisimidazolium iodide salts are accessible in moderate yields. Corresponding palladium(II)- and platinum(II)-NHC complexes could be synthesized and fully characterized, but do not show optical activity. We also report a solid state structure of one of the synthesized palladium(II) biscarbene compounds derived