- Regiocontrolled Suzuki-Miyaura couplings of 3,5-dibromo-2-pyrone
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In a similar way to its Stille coupling reactions, 3,5-di-bromo-2-pyrone undergoes the Suzuki-Miyaura coupling reactions at either the C3- or the C5-position with high regioselectivity depending on the reaction conditions.
- Ryu, Ki-Moon,Gupta, Arun Kumar,Han, Jin Wook,Oh, Chang Ho,Cho, Cheon-Gyu
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- A Short Synthesis of Delavatine A Unveils New Insights into Site-Selective Cross-Coupling of 3,5-Dibromo-2-pyrone
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The recognition of latent symmetry in delavatine A has enabled a short synthesis of the natural product starting from 3,5-dibromo-2-pyrone. The concise synthetic route features a cascade process involving a 6p electrocyclization to construct the indane co
- Palani, Vignesh,Hugelshofer, Cedric L.,Kevlishvili, Ilia,Liu, Peng,Sarpong, Richmond
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- A Unified Strategy for the Enantiospecific Total Synthesis of Delavatine A and Formal Synthesis of Incarviatone A
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We describe a symmetry-inspired synthetic approach that has enabled a short synthesis of delavatine A and a formal synthesis of incarviatone A, which are two likely biosynthetically related natural products. The indane core of these natural products was constructed through a cascade sequence involving five transformations that occur in a single pot. Leveraging symmetry has allowed us to trace both natural products back to a versatile building block, 3,5-dibromo-2-pyrone, and studies related to site-selective cross-coupling of this polyhalogenated heterocycle are described. In addition, our strategy gave access to a putative biogenetic precursor, from which the syntheses of both natural products were attempted.
- Palani, Vignesh,Hugelshofer, Cedric L.,Sarpong, Richmond
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- Stille couplings of 3-(trimethylstannyl)-5-bromo-2-pyrone for the syntheses of 3-aryl-5-bromo-2-pyrones and their ambident dienyl characters
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3-(Trimethylstannyl)-5-bromo-2-pyrone underwent facile Stille coupling reactions with aryl halides to produce various 3-substituted 5-bromo-2-pyrones. The resulting 3-aryl-2-pyrone derivatives underwent both normal and inverse electron demand D-A cycloadd
- Lee, Jin-Hee,Kim, Won-Suk,Lee, Young Yiol,Cho, Cheon-Gyu
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- Regioselective Stille coupling reactions of 3,5-dibromo-2-pyrone with various aryl and vinyl stannanes
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3,5-Dibromo-2-pyrone underwent facile regioselective Stille coupling reactions with aryl, heteroaryl and vinyl stannanes to produce various 3-substituted, 5-bromo-2-pyrones. Addition of a catalytic amount of CuI greatly increased the selectivity and chemical yield of the desired 3-aryl-5-bromo-2-pyrone. Second Stille coupling reactions on the resulting 3-aryl-2-pyrones gave rise to a series of potentially useful 2-pyrones with two different functionalities at C3 and C5 position in good to excellent isolated yields. 2-Pyrones with pyridyl groups at C3 position can undergo Lewis acid catalyzed Diels-Alder cycloaddition reactions with benzyl vinyl ether.
- Kim, Won-Suk,Kim, Hyung-Jin,Cho, Cheon-Gyu
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p. 9015 - 9017
(2007/10/03)
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