Chiral Bambusurils for Enantioselective Recognition of Carboxylate Anion Guests
作者:Jan Sokolov、Vladimír Šindelář
DOI:10.1002/chem.201802748
日期:2018.10.17
Synthesis of the first enantiomerically pure chiral bambusurils is reported. The bambusurils were prepared on the gram scale without using any chromatography techniques. The bambusurils formed supramolecular complexes with all tested chiral carboxylates including amino acids and drug molecules with the enantioselectivity ranging from 1.1 to 3.2.
Urea Substituted Imidazopyridines, Imidazoquinolines, and Imidazonaphthyridines
申请人:Kshirsagar A. Tushar
公开号:US20080015184A1
公开(公告)日:2008-01-17
Imidazopyridine, imidazoquinoline, and imidazonaphthyridine compounds having a urea substituent at the 2-position, pharmaceutical compositions containing the compounds, intermediates, and methods of making and methods of use of these compounds as immunomodulators, for modulating cytokine biosynthesis in animals and in the treatment of diseases including viral and neoplastic diseases are disclosed.
Formamides as Isocyanate Surrogates: A Mechanistically Driven Approach to the Development of Atom-Efficient, Selective Catalytic Syntheses of Ureas, Carbamates, and Heterocycles
作者:Jeffrey Bruffaerts、Niklas von Wolff、Yael Diskin-Posner、Yehoshoa Ben-David、David Milstein
DOI:10.1021/jacs.9b08942
日期:2019.10.16
dehydrogenative coupling reactions. The design of these highly atom-efficient procedures was driven by the identification and characterization of the relevant organometallic complexes, uniquely exhibiting the trapping of an isocyanateintermediate. DFT calculations further contributed to shed light on the remarkably orchestrated chain of catalytic events, involving metal-ligand cooperation.
A general strategy for the synthesis of 2N,4N′-disubstituted glycoluril enantiomers on a multigram scale using orthogonal protection is reported. The use of these glycolurils is demonstrated in the synthesis of enantiomericallypure bambus[6]uril macrocycles. Moreover, the deprotection of (S)-1-phenylethyl substituents on the macrocycle was achieved, opening access to various chiral bambus[6]urils
报道了使用正交保护在多克规模上合成 2 N ,4 N '-二取代甘脲对映体的一般策略。这些甘脲的用途已在对映体纯的竹[6]脲大环化合物的合成中得到证实。此外,实现了大环上( S )-1-苯乙基取代基的脱保护,通过大环化后修饰策略打开了各种手性竹[6]脲的通路。