cheminform abstract: platinum- and gold-catalyzed hydrative carbocyclization of oxo diynes for...
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Benzopyran derivativesR 0350 Platinum- and Gold-Catalyzed Hydrative Carbocyclization of Oxo Diynes for
One-Pot Synthesis of Benzopyrones and Bicyclic Spiro Ketones. — A variety of substituted diynones is converted to polycyclic benzoisochromenes or spirocyclic prod-ucts catalyzed by PtCl2 or AuCl(PPh3)/AgOTf. When diynals (I) are used as substrates, the corresponding benzoisochromenes are obtained, while the gold-catalyzed reaction does not deliver any satisfactory results. — (DAS, A.; CHANG, H.-K.; YANG, C.-H.; LIU*, R.-S.; Org. Lett. 10 (2008) 18, 4061-4064; Dep. Chem., Natl. Tsing Hua Univ., Hsinchu 30043, Taiwan; Eng.) — R. Steudel
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ChemInform 2009, 40, issue 05 © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim