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2005
Ring opening reactions
O 0132
Ru- and Rh-Catalyzed C—C Bond Cleavage of Cyclobutenones: Reconstructive
Selective Synthesis of 2-Pyranones, Cyclopentenes, and Cyclohexenones. —
06- 049 and
A novel Rh- or Ru-catalyzed ring opening—recyclization reaction of cyclobutenones
(I) is developed to give pyranones (II)/(III). E-Selectivity is excellent for the Rh-catalyst Rh2Cl2(CO)4. Additionally, this complex smoothly catalyzes the decarbonylative
[cf. (V)] as well as direct [cf. (VII)] coupling reaction of cyclobutenones with norbornene (IV). — (KONDO*, T.; TAGUCHI, Y.; KANEKO, Y.; NIIMI, M.;
MITSUDO*, T.-A.; Angew. Chem., Int. Ed. 43 (2004) 40, 5369-5372; Dep. Energy
Hydrocarbon Chem., Grad. Sch. Eng., Kyoto Univ., Nishiyo, Kyoto 615, Japan;
Eng.) — Mischke
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