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2005
Cyclopentane derivatives
Q 0030
Cyclopropyl Building Blocks for Organic Synthesis. Part 109. Cyclopentenones
a Novel [4 + 1]Cocyclization of Methylenecyclopropanes with Fischer Car32- 080 from
benechromium Complexes. — The reaction of methylenecyclopropane (Ia) with
Fischer carbenechromium complex (IIa) leads unexpectedly to the cyclopentenone
derivative (IIIa) via a novel [4 + 1]cocyclization. Neither the cyclopropanation of the
double bond in the compound (I) nor metathesis with the Fischer carbene (II) are observed. Methylenecyclopropanes (Ib-c) and (IV), and bicyclopropylidene (VI) react
with Fischer carbenes (II) in the same manner. — (KURAHASHI, T.; WU, Y.-T.;
MEINDL, K.; RUEHL, S.; DE MEIJERE*, A.; Synlett 2005, 5, 805-808; Inst. Org.
Biomol. Chem., Georg-August-Univ., D-37077 Goettingen, Germany; Eng.) —
R. Staver
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