205251-35-0Relevant academic research and scientific papers
Synthesis of an ovoid chiral cage
Couty, Fran?ois,David, Olivier R. P.
scheme or table, p. 1945 - 1948 (2010/04/05)
Evidence for the formation of an ovoid chiral cage, resulting from the auto-assembly of two hexafunctional and three tetrafunctional modules reacting through dynamic covalent bond formation, is provided. Georg Thieme Verlag Stuttgart.
The Lindlar Catalyst Revitalized: A Highly Chemoselective Method for the Direct Conversion of Azides to N-(tert-Butoxycarbonyl)amines
Reddy, P. Ganapati,Pratap, T. Verabhadra,Kumar, G. D. Kishore,Mohanty, Subhendu K.,Baskaran, Sundarababu
, p. 3740 - 3744 (2007/10/03)
An exceptionally chemoselective method for the direct conversion of azides to N-(tert-butoxycarbonyl)-protected amines under catalytic transfer-hydrogenation conditions, using the Lindlar catalyst, is reported. The extremely labile functional groups such as N-Cbz, benzyl ester are shown to be inert under the reaction conditions. The present method allows us to synthesize orthogonally protected (N-Cbz and N-Boc) 1,2-diamino systems, which will be immensely useful in organic synthesis.
Combinatorial chemistry for ligand development in catalysis: Synthesis and catalysis screening of peptidosulfonamide tweezers on the solid phase
Brouwer, Arwin J.,van Der Linden, Heiko J.,Liskamp, Rob M. J.
, p. 1750 - 1757 (2007/10/03)
On the basis of a pyrrolidine tweezer 1, a library of peptidosulfonamide tweezers (15a-e, 16a-e was synthesized on the solid phase. This library was screened in a simultaneous substrate screening procedure for the ability to enantioselectively catalyze the Ti(O-i-Pr)4-mediated addition of diethylzinc to aldehydes. One of the best solid-phase tweezer catalyst (i.e., 16d, giving an ee of 32% in solid-phase catalysis) was resynthesized in solution (compounds 20 and 21). The now homogeneous solution-phase catalysis showed even better enantioselectivity (i.e., up to 66%).
Tweezers with different bite: Increasing the affinity of synthetic receptors by varying the hinge part
Loewik, Dennis W. P. M.,Weingarten, W. David,Broekema, Matthias,Brouwer, Arwin J.,Still, W. Clark,Liskamp, Rob M. J.
, p. 1846 - 1850 (2007/10/03)
With preservation of selectivity, the hinge part of tweezerlike synthetic receptor molecules can be varied to achieve a higher affinity. The synthetic peptidosulfonamide receptor (below left; R = Disperse Red 1) with the bis(aminomethyl)benzoic acid hinge selectively bound the tripeptide shown below on the right (K(a) = 4100 M-1). Combination of a diversity in the hinge part with that present in the tweezer arms will provide access to large and diverse synthetic receptor libraries.
Novel quinolone derivatives as potent antibacterials
Lohray, Braj B.,Baskaran,Srinivasa Rao, Bonthu,Mallesham,Bharath,Yadi Reddy,Venkateswarlu,Sadhukhan, Ashok K.,Kumar, M. Sitaram,Sarnaik, Hemant M.
, p. 525 - 528 (2007/10/03)
Several 7-(3R,4R-N,N'-dialkyl diaminopyrrolidinyl)-substituted quinolones were synthesized and evaluated for antibacterial activities. 5-Amino-7-(3R,4R-N,N'-dimethyldiamino-6,8-difluoro-1,4-dihydro-1-cyclopropyl-4 -oxoquinoline-3-carboxylic acid was found
Sequence-Selective Peptide Binding with a Synthetic Receptor
Yoon, Seung Soo,Still, W. Clark
, p. 567 - 578 (2007/10/02)
A dye-labeled variant of a highly substrate-selective synthetic receptor for peptides is described and its binding selectivity for certain di- and tripeptide sequences is elucidated using an encoded combinatorial library.
