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ABSTRACT: The solution-phase synthesis of a 167-member library of isocoumarins is described. The key intermediates for library generation, 4-iodoisocoumarins, are easily prepared by iodocyclization of the corresponding 2-(1-alkynyl)arenecarboxylate esters. The 4-iodoisocoumarins undergo palladium-catalyzed Sonogashira, Suzuki-Miyura, and Heck reactions to yield a diverse set of isocoumarins. Alternatively, isocoumarins, bearing hydroxyl or bromine functionalities, have been prepared by ZnCl(2)- and Pd(PPh(3))(4)-mediated cyclization of the corresponding o-iodobenzoic acid and appropriate terminal alkynes. The resulting isocoumarins were further diversified by derivatization of the hydroxyl or bromine groups. A small set of isoquinolinones were also prepared from the corresponding isocoumarins.
Journal of Combinatorial Chemistry 10/2009; 11(6):1128-35. · 3.41 Impact Factor
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ABSTRACT: The solution-phase synthesis of a 111 member isoquinoline library is described. The isoquinoline scaffold has been accessed through the palladium- and copper-catalyzed cyclization of iminoalkynes and the palladium-catalyzed iminoannulation of internal alkynes, followed by diversification of hydroxyl functionality where it is present.
Journal of Combinatorial Chemistry 10/2009; 11(6):1061-5. · 3.41 Impact Factor
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Synthetic Communications 01/2007; 37(11):1879-1886. · 1.06 Impact Factor
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ABSTRACT: [reaction: see text] Indolylaryl and indolylheteroarylmaleimides, including bisindolylmaleimides, are easily prepared by the reaction of N-methylindole-3-glyoxylamide with methyl aryl acetates in the presence of potassium tert-butoxide in THF.
Organic Letters 11/2006; 8(21):4975-7. · 5.86 Impact Factor
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ABSTRACT: From a structure-activity relationship perspective, the new indolocarbazoles 11 and 12 have been synthesized and evaluated biologically as novel Chk1 inhibitors. Compounds 11 and 12 were synthesized in high yield from indole via bisindolylmaleimides 18 and 24.
Organic & Biomolecular Chemistry 10/2006; 4(17):3228-34. · 3.70 Impact Factor
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ABSTRACT: The syntheses of new nitrile and amide analogues of 7-keto Gö6976 are described. The amide analogue 22 was formed via the condensation with a new functionalized indoleacetic acid derivative 25 to overcome the solubility problem during the coupling reaction.Graphical abstract
Tetrahedron. 62(33):7838-7845.
