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2005
Ring closure reactions
O 0130
Ruthenium-Catalyzed Cyclization of Alkyne—Epoxide Functionalities Through
of the Substituent and Structural Skeleton of Epoxides. — Treatment
12- 044 Alternation
of phenyl epoxides of type (I) and (III) with the Ru catalyst shown in the scheme results
in unexpected formation of 1,2-substituted indenes and CO. Interestingly, the isomers
(IIIa) and (V) give the same product. In contrast, enynyl epoxides like (VI) and (VIII)
lead to cyclohexadienones or phenols. Mechanisms are discussed. — (MING-YUAN,
L.; MADHUSHAW, R. J.; LIU*, R.-S.; J. Org. Chem. 69 (2004) 22, 7700-7704; Dep.
Chem., Natl. Tsing Hua Univ., Hsinchu 30043, Taiwan; Eng.) — Jannicke
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