- Total synthesis of chromanol 293B and cromakalim via stereoselective amination of chiral benzylic ethers
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Stereoselective benzylic amination reaction is important for their further application as pharmaceuticals and agrochemicals, and other chemical entities. Herein, we describe the diastereoselective amination of 1,2-anti-dialkoxychromane on chromane framewo
- Ma, Sang-Ho,Kim, Yeon Su,Jung, Jun Min,Boggu, Pulla Reddy,Kim, Seung Chan,Kim, In Su,Jung, Young Hoon
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- Synthesis and activity of novel and selective Iks-channel blockers
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Since the discovery of the IKs-potassium channel as the slowly activating component of the delayed rectifier current (Ik) in cardiac tissue, the search for blockers of this current has been intense. During the screening of KATP
- Gerlach,Brendel,Lang,Paulus,Weidmann,Brüggemann,Busch,Suessbrich,Bleich,Greger
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p. 3831 - 3837
(2007/10/03)
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- Stereoselective interactions of the enantiomers of chromanol 293B with human voltage-gated potassium channels
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Selective inhibitors of the slow component of the cardiac delayed rectifier K+ current, I(Ks), are of interest as novel class III antiarrhythmic agents and as tools for studying the physiologic roles of the I(Ks) current. Racemic chromanol 293B is an inhibitor of both native I(Ks) and its putative molecular counterpart, the KvLQT1 +minK ion channel complex. We synthesized the (+)-[3S,4R] and (-)-[3R,4S] enantiomers of chromanol 293B using chiral intermediates of known absolute configuration and determined their relative potency to block recombinant human K+ channels that form the basis for the major repolarizing K+ currents in human heart, including KvLQT1+minK, human ether-a-go-go-related gene product (hERG), Kv1.5, and Kv4.3, corresponding to the slow (I(Ks)), rapid (I(Kr)), and ultrarapid (I(Kur)) delayed rectifier currents and the transient outward current (l(To)), respectively. K+ channels were expressed in mammalian cells and currents were recorded using the whole-cell patch-clamp technique. We found that the physicochemical properties and relative potency of the enantiomers differed from those reported previously, with (-)-[3R,4S]293B nearly 7-fold more potent in block of KvLQT1+minK than (+)-[3S,4R]293B, indicating that the original stereochemical assignments were reversed. K+ current inhibition by (-)-293B was selective for KvLQT1+minK over hERG, whereas the stereospecificity of block for KvLQT1+minK and Kv1.5 was preserved, with (-)-293B more potent than (+)-293B for both channel complexes. We conclude that the (-)-[3R,4S] enantiomer of chromanol 293B is a selective inhibitor of KvLQT1+minK and therefore a useful tool for studying I(Ks).
- Yang,Scherz,Bahinski,Bennett,Murray
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p. 955 - 962
(2007/10/03)
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