跳转至内容

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

摘要

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.

材料

货号

品牌

产品描述

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

铂, powder, 99.995% trace metals basis

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

铂黑, fuel cell grade, ≥99.9% trace metals basis

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

铂黑, low bulk density, ≥99.9% trace metals basis

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

铂, powder (coarse), 99.99% trace metals basis

Sigma-Aldrich

铂, wire, diam. 0.25 mm, thermocouple grade

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

铂, sponge, ≥99.9% trace metals basis

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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

Sigma-Aldrich

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