Organic Syntheses via Transition Metal Complexes, 821: Highly Selective Cyclopentadiene Annulation to Enamines via a [3+2] Cycloaddition of Alkynylcarbene Chromium and Tungsten Complexes

1 October 1995

journal article
letter
Published by Georg Thieme Verlag KG in Synlett

Vol. 1995 (10) , 1011-1013
https://doi.org/10.1055/s-1995-5160

Abstract

Alkynylcarbene complexes, (CO)₅M=C(OEt)-C≡CPh 4 (M = Cr, W), react with cyclic enamines, ~CH=C(NR₂)~ 7, 9, 11 and 13 (NR₂ = NMe₂, pyrrolidine), to afford cyclopentadiene annulation products 8, 10, 12 and 14 by an overall [3+2] cycloaddition.

Keywords

CYCLOPENTADIENES
ANNULATION BY [3+2] CYCLOADDITION
ALKYNYLCARBENE COMPLEXES
C3 BUILDING BLOCKS
ENAMINES
CARBENE COMPLEXES
OF CHROMIUM AND TUNGSTEN
1-METALLA-1
5-HEXATRIENES
STEROID SYNTHESIS

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