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Org Lett. 2013 Apr 19;15(8):1962-5. doi: 10.1021/ol400631b. Epub 2013 Apr 10.
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.
报道了 3-炔基黄酮醚的金属介导重排。整个过程涉及 5-endo 烯炔环化，生成含铂的螺环氧碳正离子中间体，该中间体可与甲醇捕获生成螺二氢呋喃，或进一步重排得到烯丙基色满二酮或苯并呋喃酮。
