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2005
Rings with 7 or more members
Q 0050
Tandem [W(CO)5]-Catalyzed Cycloisomerization—Cyclopropanation Reactions
Toward the Synthesis of Eight-Membered Carbocycles. — An effective
16- 069 Directed
general method for the synthesis of eight-membered carbocyclic rings involves a new
tandem tungsten-catalyzed cycloisomerization—cyclopropanation reaction of allyl-substituted alkynols (I), (V), (VII). The reaction can either proceed with direct photoinduced generation of W(CO)5 species from W(CO)6 in solution or with preformation
of a W(CO)5(thf) complex. Both methods provide the products (II), (VI) and (VIII),
resp., as single diastereomers. — (BARLUENGA*, J.; DIEGUEZ, A.; RODRIGUEZ,
F.; FANANAS, F. J.; Angew. Chem., Int. Ed. 44 (2005) 1, 126-128; Inst. Quim.
Organomet. "Enrique Moles", Univ. Oviedo, E-33071 Oviedo, Spain; Eng.) —
Mischke
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