作者:Hans Jürgen Bestmann、Bernd Siegel、Günter Schmid
DOI:10.1246/cl.1986.1529
日期:1986.9.5
N-Substituted keteniminylidenetriphenylphosphoranes react with isothiocyanates in a [2+2] cycloaddition to form the four-membered ring phosphonium ylides. These yield the previously unknown arylidene-2,4-bisiminothietanes with aromatic aldehydes.
A multicomponent strategy to achieve two different regioselectivities fromalkynes, isothiocyanates and H2O with a proton acid/N‐chlorophthalimide (NCPI) system is described to selectively obtain non‐aromatic five‐membered sulfur heterocycles (1,3‐oxathiol‐2‐imines/thiazol‐2(3H)‐one derivatives) through multiple bond formations. The process features readily available starting materials, mild reaction
Catalytic Enantioselective Aldol Additions of α-Isothiocyanato Imides to Aldehydes
作者:Le Li、Eric G. Klauber、Daniel Seidel
DOI:10.1021/ja804838y
日期:2008.9.17
Highly enantioselective organocatalytic aldol additions of alpha-isothiocyanato imides to aldehydes are reported. These reactions provide convenient access to enantiomerically enriched and protected beta-hydroxy-alpha-amino acids with catalyst loadings as low as 1 mol%.
The antituberculosis activity of the target compounds were tested in vitro against four Mycobacterium strains: M. H37Ra, M. phlei, M. smegmatis, M. timereck. The most active compounds were those with 2-pyridine ring. They exhibited lower minimal inhibitory concentration (MIC) values in the range 7.81⁻31.25 μg/mL in comparison to the other isomers. Compound 5 had activity against M. smegmatis at a concentration
Versatile synthesis of 2′-amino-2′-deoxyuridine derivatives with a 2′-amino group carrying linkers possessing a reactive terminal functionality
作者:Andrzej Gondela、Mateusz D. Tomczyk、Łukasz Przypis、Krzysztof Z. Walczak
DOI:10.1016/j.tet.2016.07.061
日期:2016.9
2,2′-Anhydrouridine has been successfully converted into the appropriate 2′-amino-2′-deoxyuridine derivatives in a reaction with isothiocyanates obtained from amino acids or α,ω-diaminoalkanes. The initially formed oxazolidine-2-thione ring is cleaved under basic conditions into the corresponding 2′-amino(substituted)-2′-deoxyuridine derivatives. The implemented additional terminal functionality in