Diversity Synthesis of Complex Pyridines Yields a Probe of a Neurotrophic Signaling Pathway
摘要:
Recognizing the value of including complex pyridines in small-molecule screening collections, we developed a previously unexplored [2 + 2 + 2]-cycloaddition of silyl-tethered diynes with nitriles. The tether provides high regioselectivity, while the solvent THF allows Catalytic CpCo(CO)(2) to be used without exogenous irradiation. One of the resulting bicyclic and monocyclic (desilylated) pyridines was identified as an inhibitor of neuregulin-induced neurite outgrowth (EC(50) = 0.30 mu M) in a screen that probes a pathway likely to be involved in breast cancers and schizophrenia.
One-Pot Deracemization of<i>sec</i>-Alcohols: Enantioconvergent Enzymatic Hydrolysis of Alkyl Sulfates Using Stereocomplementary Sulfatases
作者:Markus Schober、Michael Toesch、Tanja Knaus、Gernot A. Strohmeier、Bert van Loo、Michael Fuchs、Florian Hollfelder、Peter Macheroux、Kurt Faber
DOI:10.1002/anie.201209946
日期:2013.3.11
Hand in hand: The title transformation was achieved using a pair of sulfatases acting through inversion and retention of configuration on opposite substrate enantiomers. Using Pseudomonas aeruginosa arylsulfatase PAS with alkylsulfatase PISA1 in one‐pot leads to sec‐alcohols (80 to >99 % conversion) with 91 to greater than 99 % ee.
The substratespectrum of the inverting alkylsulfatase Pisa1 was investigated using a range of sec‐alkyl sulfate esters bearing aromatic, olefinic and acetylenic moieties. Perfect enantioselectivities were obtained for substrates bearing groups of different size adjacent to the sulfate ester moiety. Insufficient selectivities could be doubled by using dimethyl sulfoxide (DMSO) as co‐solvent. Hydrolytically
Diversity Synthesis of Complex Pyridines Yields a Probe of a Neurotrophic Signaling Pathway
作者:B. Lawrence Gray、Xiang Wang、W. Colby Brown、Letian Kuai、Stuart L. Schreiber
DOI:10.1021/ol8004936
日期:2008.7.3
Recognizing the value of including complex pyridines in small-molecule screening collections, we developed a previously unexplored [2 + 2 + 2]-cycloaddition of silyl-tethered diynes with nitriles. The tether provides high regioselectivity, while the solvent THF allows Catalytic CpCo(CO)(2) to be used without exogenous irradiation. One of the resulting bicyclic and monocyclic (desilylated) pyridines was identified as an inhibitor of neuregulin-induced neurite outgrowth (EC(50) = 0.30 mu M) in a screen that probes a pathway likely to be involved in breast cancers and schizophrenia.