Metal-catalyzed cascade rearrangements of 3-alkynyl flavone ethers.

Metal-catalyzed cascade rearrangements of 3-alkynyl flavone ethers.

Organic letters (2013-04-12)

Yuan Xiong, Scott E Schaus, John A Porco

초록

Metal-mediated rearrangements of 3-alkynyl flavone ethers are reported. The overall process involves 5-endo enyne cyclization to a platinum-containing spiro-oxocarbenium intermediate which may be trapped with methanol to produce spirodihydrofurans or further rearranged to afford either allenyl chromanediones or benzofuranones.

MATERIALS

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브랜드

제품 설명

349348

Sigma-Aldrich

Platinum, foil, thickness 0.127 mm, 99.99% trace metals basis

349402

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Platinum, wire, diam. 0.25 mm, 99.9% trace metals basis

444685

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Platinum, wire, diam. 2.0 mm, 99.9% trace metals basis

349321

Sigma-Aldrich

Platinum, foil, thickness 0.25 mm, 99.99% trace metals basis

349380

Sigma-Aldrich

Platinum, foil, thickness 0.1 mm, 99.9% trace metals basis

267821

Sigma-Aldrich

Platinum, wire, diam. 0.127 mm, 99.9% trace metals basis

520780

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Platinum black, fuel cell grade, ≥99.9% trace metals basis

520799

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Platinum black, low bulk density, ≥99.9% trace metals basis

298093

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Platinum, gauze, 100 mesh, 99.9% trace metals basis

267244

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Platinum, foil, thickness 0.025 mm, 99.9% trace metals basis

205915

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Platinum black, black, powder, ≤20 μm, ≥99.95% trace metals basis

357375

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Platinum, wire, diam. 0.076 mm, ≥99.99% trace metals basis

327484

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Platinum, shot, ≤3 mm, ≥99.9% trace metals basis

357359

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Platinum, wire, diam. 0.20 mm, ≥99.99% trace metals basis

267201

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Platinum, wire, diam. 0.5 mm, 99.99% trace metals basis

327433

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Platinum, foil, thickness 0.125-0.135 mm, 99.9% trace metals basis

267163

Sigma-Aldrich

Platinum, wire, diam. 0.127 mm, 99.99% trace metals basis

357367

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Platinum, wire, diam. 0.10 mm, 99.99% trace metals basis

267260

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Platinum, foil, thickness 0.5 mm, 99.99% trace metals basis

267171

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Platinum, wire, diam. 0.25 mm, 99.99% trace metals basis

267155

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Platinum, sponge, ≥99.9% trace metals basis

685453

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Platinum, nanopowder, <50 nm particle size (TEM)

327492

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Platinum, wire, diam. 1.0 mm, 99.9% trace metals basis

267228

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Platinum, wire, diam. 0.5 mm, 99.9% trace metals basis

298107

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Platinum, gauze, 52 mesh, 99.9% trace metals basis

204013

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Platinum, powder, 99.995% trace metals basis

373214

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Platinum, evaporation slug, diam. × L 0.6 cm × 1.2 cm, 99.99% trace metals basis

349372

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Platinum, foil, thickness 1.0 mm, 99.99% trace metals basis

349356

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Platinum, foil, thickness 0.05 mm, 99.99% trace metals basis

349364

Sigma-Aldrich

Platinum, foil, thickness 0.025 mm, 99.99% trace metals basis