5-Methoxy- and 5-dialkylamino-bicyclo[3.2.0]hept-2-en-6-one derivatives 2 and 3 are formed in high yield by cine substitution at the fused exo-chlorocyclobutanone 1, subsequent reactions yielding 2-phenyltropone 6 and a cycloheptadienone enamine 8.
H. Butenschön, J. Chem. Soc., Perkin Trans. 1, 1991, 483 DOI: 10.1039/P19910000483
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